# Understand version numbers

A version number identifies the product release. The product contains the latest Generally Available (GA) features at the time of that release. 

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        border-collapse: collapse;
        width=100%;
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    table td {
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    tr:nth-child(even){
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| 8.0.29| -21. | 2 |
|---|---|---|
| Base version | Minor build version | Custom build |

Percona uses semantic version numbering, which follows the pattern of base version, minor build version, and an optional custom build. Percona assigns unique, non-negative integers in increasing order for each minor build release. The version number combines the base [MySQL 8.0](https://dev.mysql.com/doc/relnotes/mysql/8.0/en/) version number, the minor build version, and the custom build version, if needed.

For example, the version numbers for Percona Server for MySQL 8.0.29-21.2 define the following information:

* Base version - the leftmost numbers indicate [MySQL 8.0](https://dev.mysql.com/doc/relnotes/mysql/8.0/en/) version used as a base. 

* Minor build version - an internal number that increases by one every time Percona Server for MySQL is released.

* Custom build version - an optional number assigned to custom builds used for bug fixes. The software features, unless they’re included in the bug fix, don’t change.

Percona Server for MySQL 8.0.28-19 and 8.0.28-20 are both based on MySQL 8.0.28.