shell terminal:

shell (also referred to as terminal or shell): acts as a translator between the people and the core (hardware), because people are unable to communicate directly and hardware, shell acts as a core role of human interaction user to command. " told the "end, it will invoke the appropriate service program to complete certain operations. linux terminal is using the default "bash interpreter (Bourne-Again shell)". shell is more popular to talk to a human language instructions into the computer can understand (binary), then the result of human-computer can process the conversion understand the language.