Programming is required whenever a website contains information that needs to change automatically. The reasons for website content to change are numerous including, customising a webpage specifically to the user who is visitng it. displaying live, or real-time data or simply if the site contains so muchj data that mainting the individual pages would be unmanageable. Becuase of the complexity adn possible number of variations the site needs to be developed in touch a ways where rules determin what the component parts and the content of the website will be. These rules are defined with a programming language such as PHP, ASP, PERL or Ruby.
When a web page is loaded, in most cases the web page will not exist until it is requested from the server, at the point that this request is made the page is assembled from a number of sources inluding static html files stored on the server and content stored in databases. The programmer would write all the rules that determin how the html is to be assembled in a programming language so the server knows how to create the pages. As the programmer must account for every variation in a scenario programming is frequently a fairly time consuming activity.
It is worth mentioning that HTML is not a programing language but a markup language in that it defines the structure and herachy of the content rather. Though to the lamen HTML code (markup) looks like progamming code they are quite different things with html being far simpler to learn. Put simply html works by putting tags are before and after a piece of content to tell the web browser what that piece of contnent is, there are exceptions to this but broadly speaking this is how it works.
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