Subversion is a version control system that helps developers manage changes to their code over time. It allows multiple people to work on the same project without overwriting each other's work. By keeping track of every change, Subversion makes it easy to revert to previous versions if something goes wrong, ensuring that the project remains stable and organized. One of the key features of Subversion is its ability to handle large files and binary data, which is useful for projects that include images or videos. It also supports branching and merging, allowing teams to experiment with new ideas while keeping the main project intact. This flexibility makes Subversion a popular choice among software development teams.