What does Source Code mean?
Source code is the human-readable description of a program or document. For a website, the HTML source code delivered by the server should be distinguished from browser content changed afterward.
AN EXAMPLE IN PRACTICE
Where you might encounter it
“View source” shows the HTML delivered by the server. Developer tools can also show changes made by JavaScript after the page has loaded.
From NetzTurm Decode. Clear explanations with historical context.