Homebrew is a package manager for macOS and Linux that simplifies the installation and management of software. It allows users to easily install, update, and remove applications and tools from the command line, making it a popular choice among developers and tech enthusiasts. With Homebrew, users can access a vast repository of software packages, known as "formulae," which are maintained by the community. This tool streamlines the process of setting up development environments and ensures that users have the latest versions of their desired applications without the hassle of manual installations.