The primary function of source code management in teams is to ensure efficient collaboration and control over code changes. It allows multiple developers to work on a codebase simultaneously while keeping track of modifications, versions, and conflicts. Tools like Git facilitate the merging of changes and provide a history of code adaptations, enabling teams to revert to prior versions if necessary. Effective source code management boosts developer productivity, enhances code quality, and mitigates risks associated with collaboration, such as lost work or miscommunication.