Hex is a package manager for the Erlang ecosystem, primarily used for managing dependencies for the Elixir programming language. It provides a repository for publishing and retrieving libraries, helping developers to easily share and collaborate on their Elixir and Erlang projects. Hex offers efficient dependency management, versioning, and security features, making it an essential tool for developers in these languages. The official website for Hex is [hex.pm](https://hex.pm), where users can search for packages, view documentation, and access resources related to package management in the Erlang ecosystem.