The software version number is divided into 3 parts: version, release and revision.

For example: version 8.2.8 = version 8, release 2, revision 8

        version = version number of the software
        release = number of releases of the software, within the version
        revision = number of revisions to the software, within the release

Going from version 7.x.x to version 8.x.x is called a major version upgrade.

Going from version 7.1.4 to version 7.2.35 is called a minor version upgrade.