what is Custom Setting in Salesforce?

Custom settings are similar to custom objects and enable application developers to create custom sets of data, as well as create and associate custom data for an organization, profile, or specific user. … This data can then be used by formula fields, validation rules, flows, Apex, and the SOAP API.

Custom Setting: Custom settings are alike to custom objects. It is stored in the application cache, which enables efficient access without the cost of multiple repeated queries to the database. So we can avoid governor limits by using this. It allows us to store a set of data and access it without querying it from the apex.