Bitbucket Pipelines is a continuous integration and delivery (CI/CD) platform that enables developers to build, test, and deploy their code from within their Bitbucket repository. With Pipelines, developers can quickly and easily set up automated workflows to build, test, and deploy
From Wikipedia
Bitbucket is a Git-based source code repository hosting service owned by Atlassian. Bitbucket offers both commercial plans and free accounts with an unlimited number of private repositories.