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A comment is text that the compiler ignores but that is useful for programmers. Comments are normally used to annotate code for future reference. The compiler treats them as white space.

The WHITESPACE_ONLY compilation level removes comments from your code and also removes line breaks, unnecessary spaces, extraneous punctuation (such as parentheses and semicolons), and other whitespace. The output JavaScript is functionally identical to the source JavaScript.

Code generation is the last stage of the compilation proper during which the code-generator converts a well-formed source code into an intermediate representation that can be either executed by the interpreter without being previously translated into an object code or further compiled into the native code.

Compilation process in C involves four steps: pre-processing, compiling, assembling, and linking. The preprocessor tool helps in comments removal, macros expansion, file inclusion, and conditional compilation.

The process of converting the source code written in any programming language(generally, mid-level or high-level language) into machine-level language that is understandable by the computer is known as Compilation. The software that is used for this conversion is known as a Compiler.

Preprocessing. The first stage of compilation is called preprocessing. In this stage, lines starting with a # character are interpreted by the preprocessor as preprocessor commands. These commands form a simple macro language with its own syntax and semantics.

There are three basic steps involved in compiling a C program: preprocessing, compilation of C source code to machine code (or assembly) (also called object code), and linking of multiple object files into a single binary executable program.