Given its open-source nature, the program can be easily installed without any complications in the free version, directly from the provider's server when the web hosting in question is purchased. Of course, there may be situations where the program is not installed, but this is not the case with WordPress as this CMS is already set up for integration with MySQL.
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MySQL is the relational database
The spread of this program is certainly due to its flexibility and ease of use: with this application it is possible to modify the source code without paying, obtaining a fairly good level of freedom, which can only increase in the case of paid functions.

Even the installation and the first use are simple and do not require more than 10 minutes from the moment you start it to the moment you can already work. Furthermore, although essentially free, MySQL has high performance with a range of cluster servers capable of storing enormous amounts of data: this makes it versatile, because it adapts to both large companies and small website managers, who are beginners and may have difficulty with more complex systems.