For questions about Configuration as Code (CasC)
Configuration as Code (CasC) is describing the configuration of a system, tool, service or resource in a code format, allowing it to be stored, versioned and processed in the same way as code is.
It is typically used in automated configuration management - as a component of the similar but larger scope Infrastructure as Code.
Various tools have various ways of using configuration as code:
some can configure themselves, for example:
other, more generic Infrastructure as Code tools use it to configure 3rd party services/tools/resources, for example: