Bazel is an open-source build and test tool developed by Google that is designed to handle large codebases and support a wide range of programming languages. It uses a high-level build language to define project dependencies and build rules, ensuring efficient and reliable builds. Bazel's incremental build capabilities and advanced caching mechanisms reduce build times and improve developer productivity. It supports building and testing software across multiple platforms, making it a versatile tool for complex, large-scale projects. Bazel integrates with various CI/CD systems, enabling automated builds and tests as part of the development pipeline.