In computer science, code is any collection of computer instructions (possibly with comments) written using some human-readable computer language, usually as text.
In computer science, source code is any collection of computer instructions (possibly with comments) written using some human-readable computer language, usually as text. The source code of a program is specially designed to facilitate the work of computer programmers, who specify the actions to be performed by a computer mostly by writing source code.
Questions having the tag code regards the user experience of code in design and implementation.
Reference: Wikipedia - Source Code