Backtrack 5 is an open source security-focused Linux distribution that is used for security testing and network penetration testing. It includes a large collection of tools and utilities that can be used to perform various security tasks such as vulnerability analysis, wireless attack, and digital forensics.
If you are interested in using Backtrack 5, the first step would be to download the latest version of the operating system from the official website. Once you have downloaded the operating system, you can then install it on your computer following the installation instructions provided.
Once you have installed Backtrack 5, it is recommended that you familiarize yourself with the available tools and utilities. This can be done by reading the documentation and tutorials available online, or by taking an online or in-person course. Additionally, it is important to practice using the tools and utilities in a safe and secure environment in order to gain a better understanding of how they work and how to use them correctly.