BoltDB is an embedded key-value database written in Go, designed for simplicity and high performance. It provides a low-level persistent storage layer for Go applications, allowing for ACID transactions, forward and backward data iteration, and fast read access. BoltDB is particularly well-suited for applications requiring reliable data storage on-disk without needing a separate database server. As an embedded database, it integrates directly into applications, reducing overhead and complexity. However, it's worth noting that BoltDB is no longer actively maintained, and users are encouraged to consider its forks or alternatives for projects requiring long-term support. The project is available for review and usage on GitHub at https://github.com/boltdb/bolt.