Source Code
Source Code is any collection of text, with or without comments, written using a human-readable Programming Language, usually as plain 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. The Source Code is often transformed by an Assembler or Compiler into binary Machine Code that can be executed by the computer. Alternatively, Source Code may be interpreted and thus immediately executed by an Interpreter.
Most application software is distributed in a form that includes only the executable files. If the Source Code were included, it would be useful to a user, programmer, or system administrator who might wish to study or modify the program. This philosophy is central to the Open-Source-Software movement, championed by organizations like the Free Software Foundation and projects such as the Linux Kernel. Historically, Ada Lovelace is credited with writing the first algorithm intended for processing by a machine, effectively creating the first instance of Source Code for the Analytical-Engine.
Managing Source Code efficiently requires tools like Git for version control and platforms like GitHub for collaboration. Developers often use an Integrated-Development-Environment to write and debug their work. For more technical definitions, you can visit the Wikipedia entry on Source Code or the MDN Web Docs Glossary.