Bitbucket is a code hosting service that allows for version control using Git and Mercurial repositories. It offers free accounts and paid plans. Key features include pull requests, code review, two-factor authentication, Git LFS, documentation hosting, issue tracking, and static site hosting. The document then provides instructions on setting up SSH keys, cloning repositories, common Git commands like add, commit, push, and operations like branching, merging, and deleting branches. It also discusses webhooks and includes sample interview questions about Git and Bitbucket.