A README file is the front-page document of a software repository. It explains what the project is for, how to install it, and how to start using it. In secure development, a good README helps users understand the code before they run anything, and it often includes setup steps, dependencies, and usage examples.
In cyber security, README files matter because attackers can weaponize that trust. A convincing README can hide malicious commands inside polished installation instructions, making a fake project look legitimate to both people and automation tools. Defenders should treat README-based setup text as untrusted until the source is verified, especially when it asks for shell commands, package installs, or agent-driven execution. Checking repository history, maintainer identity, signatures, and upstream references helps reduce the risk of supply-chain and social-engineering attacks.