What is Buildkite and how does it function? Buildkite is a Continuous Integration tool that is open-source and designed to optimize the speed, security, and control of application infrastructure. It operates as a fully automated system, starting with checking the source code and then executing overrides and custom hooks. Builds are then run, ensuring that the source code remains within the infrastructure. Buildkite is compatible with various platforms and operating systems, including Windows, MacOS, Ubuntu, and Debian. Its CI tool features metadata and artifact storage, allowing for share-nothing and state-free builds that can be easily scaled and distributed across multiple agents. It also enables users to automate complex delivery pipeline tasks and unblock them using its web interface or API. Additionally, Buildkite provides REST APIs, GraphQL APIs, and Webhooks that can be utilized to create customized tools and workflows to meet team requirements.