The programs in this language are called scripts. They can be written right in a web page’s HTML and run automatically as the page loads.
Scripts are provided and executed as plain text. They don’t need special preparation or compilation to run.
Every time a web page does more than just sit there and display static information for you to
- look at displaying timely content updates,
- interactive maps,
- animated 2D/3D graphics,
- scrolling video jukeboxes, etc.