Difference between Protected and Internal

What the difference between protected and internal? What about "protected internal"?

Protected:

The type or member can be accessed only by code in the same class or struct, or in a class that is derived from that class.

Internal:

The type or member can be accessed by any code in the same assembly, but not from another assembly.

Protected Internal:

The type or member can be accessed by any code in the same assembly, or by any derived class in another assembly.