Format of Compound Number in Release Versionining

Write down the format of the compound number normally used for release versioning

Although there is no industry standard, typically, a three field compound number of the format “X.Y.Z” is used. The different fields communicate functionality information about the product release. The first digit, X, is used for the major release number which is used to identify a major increase in the product functionality. The second digit, Y, stands for feature release number.
The feature release number is iterated to identify when a set of product features have been added or significantly modified from their originally documented behavior. The third digit, Z, is called the defect repair number and is incremented when a set of defects is repaired.