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Software versioning is the process of assigning unique version names or unique version numbers to unique states of computer software. The most widely adopted scheme for version numbers is known as semantic versioning (SemVer), which comprises a three-part version number (Major.Minor.Patch), an optional prerelease tag, and an optional build meta tag. A fourth number may also be used to denote the software build, as was the case for Adobe Flash. Some companies also rely on the build date, in a system known as calendar versioning, and letters and other characters, such as Lotus 1-2-3 Release 1a.