SQL Server Resource Governor is a feature that you can use to manage SQL Server workload and system resource consumption. Resource Governor enables you to specify limits on the amount of CPU, physical I/O, and memory that incoming application requests can use.
The following concept is fundamental to understanding and using Resource Governor:
* Workload groups. A workload group serves as a container for session requests that have similar classification criteria. A workload allows for aggregate monitoring of the sessions, and defines policies for the sessions. Each workload group is in a resource pool. Two workload groups (internal and default) are created and mapped to their corresponding resource pools when SQL Server is installed. Resource Governor also supports user-defined workload groups.
Reference:
https://docs.microsoft.com/en-us/sql/relational-databases/resource-governor/resource-governor?view=sql-server-ver15