Regression testing is a form of functional testing that ensures newly released features and updates don't compromise existing functionality, but it can also be used to validate units of code when merged into the larger trunk. It's crucial to have access to the necessary infrastructure to support regression tests and other types of testing. Continuous Integration (CI) is a software development practice that helps teams ship higher quality software faster by automating processes and removing bottlenecks, but it requires a sound test automation strategy to avoid testing becoming a bottleneck. Sauce Labs provides on-demand cloud-based infrastructure that supports CI and automated testing, allowing teams to achieve development velocity and scale their efforts.