What is Source Code?

In com­puter sci­ence, source code is any col­lec­tion of com­puter instruc­tions (pos­si­bly with com­ments) writ­ten using some human-readable com­puter lan­guage, usu­ally as text.

Source code is pri­mar­ily used as input to the process that pro­duces an exe­cutable pro­gram (i.e., it is com­piled or inter­preted). It is also used as a method of com­mu­ni­cat­ing algo­rithms between peo­ple (e.g., code snip­pets in books).

Source:  wikipedia.org