Ever use a Search Engine? I'm sure you have, lots of time. When Search Engines found thousands of results for a keyword do they spit out all the result in one page? Nope, they use paging to show the result little by little.
Paging means showing your query result in multiple pages instead of just put them all in one long page. Imagine waiting for five minutes just to load a search page that shows 1000 result. By splitting the result in multiple pages you can save download time plus you don't have much scrolling to do.
To show the result of a query in several pages first you need to know how many rows you have and how many rows per page you want to show. For example if I have 295 rows and I show 30 rows per page that mean I'll have ten pages (rounded up).
