CircleCI is a cloud-based CI tool that integrates with GitHub, Bitbucket, and GitLab, focusing on speed and configuration simplicity.

• Features:
  1. Native Docker support for building and testing containerized applications.
  2. Parallelism: Run multiple jobs at the same time to speed up builds.
  3. Integration with cloud providers like AWS and Google Cloud.

• Common Use Cases:
  1. Fast, efficient CI/CD pipelines for cloud-native applications.
  2. Optimized workflows for scaling builds.