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A compiler is a computer program that translates computer code written in one programming language into another programming language. The first language is called the source language, and the code is called source code. The second language is called the target and can usually be understood by computers.
Interpreter translates just one statement of the program at a time into machine code. Compiler scans the entire program and translates the whole of it into machine code at once
A Computer understands only binary language and executes instructions coded in binary language. It cannot execute a single instruction given in any other form. Therefore, we must provide instructions to the computer in binary language.
Compilers are utility programs that take your code and transform it into executable machine code files.