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[[!meta title="About"]]
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> **amnesia**, *noun*:<br/>
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> forgetfulness; loss of long-term memory.

> **incognito**, *adjective & adverb*:<br/>
> (of a person) having one's true identity concealed.

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Tails is a live system that aims to preserve your privacy and anonymity. It
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helps you to use the Internet anonymously and circumvent censorship almost anywhere you go and on any
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computer but leaving no trace unless you ask it to explicitly.
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It is a complete operating system designed to be used from a DVD, USB stick, or SD card
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independently of the computer's original operating system. It is [[Free
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Software|doc/about/license]] and based on [[Debian GNU/Linux|https://www.debian.org/]].
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Tails comes with several built-in applications pre-configured with security in
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mind: web browser, instant messaging client, email client, office suite, image
and sound editor, etc.
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[[!toc levels=2]]
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<a id="tor"></a>

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Online anonymity and censorship circumvention
=============================================
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Tor
---

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Tails relies on the Tor anonymity network to protect your privacy
online:
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  - all software is configured to connect to the Internet through Tor
  - if an application tries to connect to the Internet directly, the
    connection is automatically blocked for security.
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Tor is free software which forms an open, distributed network that helps defend
against traffic analysis, a form of
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network surveillance that threatens personal freedom and privacy, confidential
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business activities and relationships, and state security.
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Tor protects you by bouncing your communications around a network of
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relays run by volunteers all around the world: it prevents somebody watching
your Internet connection from learning what sites you visit, and it prevents the
sites you visit from learning your physical location.

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Using Tor you can:

  - be anonymous online by hiding your location,
  - connect to services that would be censored otherwise;
  - resist attacks that block the usage of Tor using circumvention tools
    such as [[bridges|doc/first_steps/startup_options/bridge_mode]].

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To learn more about Tor, see the official [Tor
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website](https://www.torproject.org/), particularly the following pages:
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- [Tor overview: Why we need
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  Tor](https://www.torproject.org/about/overview.html.en#whyweneedtor)
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- [Tor overview: How does Tor
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  work](https://www.torproject.org/about/overview.html.en#thesolution)
- [Who uses Tor?](https://www.torproject.org/about/torusers.html.en)
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- [Understanding and Using Tor — An Introduction for the
  Layman](https://trac.torproject.org/projects/tor/wiki/doc/TorALaymansGuide)
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To learn more about how Tails ensures all its network connections use Tor,
see our [[design document|contribute/design/Tor_enforcement]].
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I2P
---

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You can also use Tails to access
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[I2P](https://geti2p.net) which is an anonymity network different from Tor.
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[[Learn how to use I2P in Tails in the documentation.|doc/anonymous_internet/i2p]]

To know how I2P is implemented in
Tails, see our [[design document|contribute/design/I2P]].
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<a id="amnesia"></a>

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Use anywhere but leave no trace
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===============================
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Using Tails on a computer doesn't alter or depend on the operating system
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installed on it. So you can use it in the same way on your computer, a
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friend's computer, or one at your local library. After shutting down Tails,
the computer will start again with its usual operating system.
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Tails is configured with special care to not use the computer's hard-disks,
even if there is some swap space on them. The only storage space used by Tails is
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in RAM, which is automatically erased when the computer shuts down. So
you won't leave any trace on the computer either of the Tails system itself or
what you used it for. That's why we call Tails "amnesic".
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This allows you to work with sensitive documents on any computer and protects you
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from data recovery after shutdown. Of course, you can still explicitly save
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specific documents to another USB or external hard-disk and take them away for
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future use.

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<a id="cryptography"></a>

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State-of-the-art cryptographic tools
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====================================

Tails also comes with a selection of tools to protect your data using strong
encryption:

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  - [[Encrypt your USB sticks or external
    hard-disks|doc/encryption_and_privacy/encrypted_volumes]] using <span
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    class="definition">[[!wikipedia LUKS]]</span>, the Linux standard for
    disk-encryption.

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  - Automatically use HTTPS to encrypt all your communications to a number of
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    major websites using [HTTPS
    Everywhere](https://www.eff.org/https-everywhere), a Firefox extension
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    developed by the [Electronic Frontier Foundation](https://www.eff.org).
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  - Encrypt and sign your emails and documents using the *de facto* standard
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    <span class="definition">[[!wikipedia OpenPGP]]</span> either from Tails
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    email client, text editor or file browser.
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  - Protect your instant messaging conversations using <span
    class="definition">[[!wikipedia Off-the-Record_Messaging
    desc="OTR"]]</span>, a cryptographic tool that provides encryption,
    authentication and deniability.

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  - [[Securely delete your files|doc/encryption_and_privacy/secure_deletion]]
    and clean your diskspace using [[Nautilus
    Wipe|http://wipetools.tuxfamily.org/nautilus-wipe.html]].

[[Read more about those tools in the documentation.|doc/encryption_and_privacy]]

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What's next?
============

To continue discovering Tails, you can now read:

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  - the [[warning page|doc/about/warning]] to better understand the security limitations of Tails and Tor,
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  - more details about the [[features and software|doc/about/features]] included in Tails,
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  - our [[documentation|doc]] explaining in detail how to use Tails,
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  - some hints on why [[you should trust Tails|doc/about/trust]],
  - our [[design document|contribute/design]] laying out Tails specification, threat model and implementation,
  - the [[calendar|contribute/calendar]] that holds our release dates, meetings and other events.
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Press and media
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===============

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See [[Press and media information|press]].
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Acknowledgments and similar projects
====================================

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See [[Acknowledgments and similar projects|doc/about/acknowledgments_and_similar_projects]].