The Composite/Aggregate Reuse Principle (CARP) is generally called the Composite Reuse Principle (CRP), which is defined as: try to use composite/aggregate instead of inheriting to achieve the purpose of reuse.

The principle of composition/aggregation reuse is to use some existing objects in a new object to make it a part of the new object; the new object achieves the purpose of reusing existing functions by delegating to these objects held internally. Instead of getting existing functions through inheritance.