you mixed up something
Terminal is the console/terminal emulator, internal can be anything, newest one of course is Windows Terminal, older are Powershell/CMD console but both are virtually the same
you can run cmd, powershell and unix shell (via Cygin,Msys, used to be able to) inside windows.

commandline processor is CMD, or Powershell, CMD exist for compatibility reason, powershel is the newest and more advanced.