What describes a build system that is used on-premises, necessitating installation and configuration?

A build system that operates on-premises and requires installation and configuration typically refers to Jenkins. Jenkins is an open-source automation server that facilitates continuous integration and continuous delivery by automating parts of the software development process. It allows developers to set up build environments according to their specific needs, providing flexibility in the way builds are executed.

Jenkins is known for its extensibility through its wide array of plugins, which support building, deploying, and automating projects in various languages. Users can configure their Jenkins instance with various tools, dependencies, and custom build solutions, which allows for a tailored approach to software development within an organization's infrastructure.

In contrast, Travis CI, CircleCI, and GitLab CI are cloud-based continuous integration services. They require minimal setup on the user's part because they are hosted by the providers, which often streamlines the integration process but does not fit the criteria of needing on-premises installation and configuration.