Deployment frequency refers to how often a team pushes updates into production. It's an important indicator of a team's agility in shipping new features, bug fixes, or patches. Three factors that can affect deployment frequency are lack of automated rollbacks in the CI/CD pipeline, inefficient testing processes and lack of confidence in test infrastructure, and human factors impacting release speed. Automating rollbacks, focusing on smarter test implementation, and improving team collaboration can help boost deployment speed and confidence.