Vaddi Sudhakar

The computer can understand only binary language, which is object code. In your code, let's say you have used some functions like print, loops like (for, while etc.), conditions like if, case etc.
For ex: X =20
10 = Y
print(X,Y)
Compiler flags error for 10 = Y as it is syntax(grammar) error. You need to rectify the error.
In the above code, you have used print.
But how do computers know what to do with print? It does not. These pre-written built-in functions are already written in a binary language and are stored in Libraries. That means you need not write code for these functions. All that you need to do is, use them. When your source code is converted into object code, the compiler will check for syntax, if fine, converts them to object code.
and then your object code is linked with Libraries (means semantics is established)
E.g., Ravana Killed Rama. This is syntactically right but semantically (meaning implied by the sentence is "Meaningless sentence").
Rama killed Ravana is syntactically and semantically CORRECT.
In the same way, when you use print in your code, the meaning or what to do will be implied during linking to libraries. Then only object code will be converted into complete Executable code.
The Executable code, without regard for device/OS, can execute anywhere.