How do computers understand code?

The computer isn't really understanding the words you type into your IDE. The compiler first translates the code into a series of ones and zeros. A one means that a circuit is complete and a zero means that it's off. THe pattern of the ones and zeros are what the computer uses to accomplish a a certain command. That's just life an overview of what is happening under the hood. The reality is much more complicated.

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Asian people explain it to them .

The code or programming language is what humans understand. It gets translated to machine language which the computer understands then runs it.

Read the book, "But How Do It Know?".

in binary mostly

A CPU has an instruction set that can pull in numbers, put them in registers, perform operations and push back out results. This code is called "assembly language".

A "compiled" program takes human-readable text like "a = b + c;" and translates it to a set of assembly language rows that:

* Pulls a value from memory location b into register 1

* Pulls a value from memory location c into register 2

* Add the contents of register 1 to register 2

* Push the contents of result register to memory location a

There is an entire sub-study of computer science called "Compiler Theory" that lists the problems and techniques for this translation to create a programming language.

Look up "CPU Instruction Set" if you want some concrete examples.

Computers do not 'understand' code, computer programs are translated into a binary instruction stream that is the 'language' that the computer processor can execute. If you look around you may find a simple computer emulator/tutor/? program that tries to show how a processor works.

The machine's operating system is pre-programmed to accept and work with code.