Repl.it is introducing its Database key-value store, built into every repl, which allows users to store data without setup or configuration. The database supports simple operations such as setting keys to values, getting values, deleting keys, and searching for keys. It provides clients for Python, Node.js, and Go, but can also be accessed from any language over HTTP. Users can start using Database immediately by importing one of the provided packages and starting to set keys in their database. This feature is designed to support a wide range of applications, including blogs, game backends, and email platforms.