In software development, "source control" refers to the management of changes to source code over time. It involves using version control systems (VCS) like Git or Subversion, which track modifications, allowing multiple developers to collaborate efficiently. Source control mitigates risks associated with code changes, providing a backup system for the codebase and enabling developers to revert to earlier versions if necessary. This practice ensures code integrity, reduces the likelihood of conflicts, and fosters collaborative development environments, leading to more organized and reliable software projects.