Back in the old days, web pages were served as is by static servers. All navigation and interaction were based on those pages; you had to transition from one page to another, nothing was dynamic, and you could not show or hide a block of text, or do something similar.
Later, servers started to use templates to deliver HTML to the client. Languages such as Java, PHP, Python, ASP, VBScript, Perl, and Ruby were suitable for such tasks. Those pages were called server-generated. The interaction though was still the same: page transitions.
Then JavaScript and VBScript came into play for very simple client-side user interaction, just some hover effects and simple scripts here and there to show or hide server-generated content. ...
