TeamCity is a continuous integration and continuous deployment (CI/CD) server developed by JetBrains. It helps software development teams automate the process of building, testing, and deploying applications, ensuring that code changes are integrated smoothly and efficiently. With features like build configuration, version control integration, and real-time reporting, TeamCity supports various programming languages and frameworks. It allows teams to detect issues early in the development cycle, improving code quality and accelerating the release process.