The "major.minor.patch" versioning system is a way to categorize software updates. The first number, major, indicates significant changes that may break compatibility with previous versions. The second number, minor, represents smaller updates that add features but maintain compatibility. The last number, patch, is for minor fixes or improvements that do not affect functionality. This system helps developers and users understand the nature of changes in software. By following this format, developers can communicate the level of impact an update may have, making it easier for users to decide when to upgrade their software.