Jenkins is an open-source automation server used for continuous integration and delivery. Teams use it to build, test, and deploy software across a wide range of languages and environments.
Where Jenkins shines is flexibility: you can model almost any workflow, integrate with most tooling, and run it in cloud, hybrid, or on-prem environments. The trade-off is operational complexity — pipelines sprawl, plugins drift, and access control is easy to get wrong without clear patterns.