Maybe this is a silly question, but I\'ve always assumed each number delineated by a period represented a single component of the software. If that\'s true, do they ever rep
Yup. Major releases add big, new features, may break compatibility or have significantly different dependencies, etc.
Minor releases also add features, but they're smaller, sometimes stripped-down ported versions from beta major release.
If there is a third version number component, it's usually for important bugfixes, and security fixes. If there are more, it really depends so much on product that it's difficult to give general answer.