Choose the image that matches your architecture and use case.

Tails is a portable Debian-based operating system designed to protect privacy and resist surveillance. It routes network traffic through Tor, is intended to run from removable media and includes carefully selected tools for secure communication and handling sensitive information.
Tails is primarily suited to daily desktop use, study, web browsing and productivity; authorized security testing, forensics and technical training; users who place additional emphasis on privacy and limiting data exposure. Before choosing it, compare the current release lifecycle with the length of support required for the machine. This distribution is based on debian, which influences package formats, repositories and much of the available documentation. The listed desktop environment is GNOME; confirm its memory, graphics and accessibility requirements on the official project site. The best choice depends on hardware support, preferred software, update policy and the amount of system administration the user wants to perform.
Read the release notes and installation guide before downloading. Select an image that matches the processor architecture and intended use: desktop, server, live media, virtual machine or another published edition. Test Wi-Fi, graphics, audio, storage and suspend from live media when that option is available. Back up important files before repartitioning, encryption changes or dual-boot installation. Security distributions should only be used against systems and networks you own or are explicitly authorized to assess. Download from an official project page or mirror, compare the published SHA-256 checksum, and verify a signed checksum when the project provides one. After installation, apply updates before adding third-party repositories or drivers.
Specialist tools, live operation and virtual machines can require substantially more memory and storage than the base system.
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