built-in set of machine code instructions of computer are called

The built-in set of machine code instructions of a computer are called instruction set architecture (ISA).

Here’s a breakdown:

Instruction Set: This refers to the collection of all machine code instructions a particular processor can understand and execute.

Architecture: This encompasses the processor’s design, including how it fetches, decodes, and executes instructions.

ISA essentially defines the “language” a processor speaks and how it interacts with memory and other hardware components. Different processors from different manufacturers (e.g., Intel, AMD) will have different ISAs.