1. Scrolling is not a "computer concept", it comes from scrolls.

2. Paging and scrolling are different things. Paging can works well when you're dealing with things that don't need compared (like a list of names in a phone book) but it breaks when you want to compare things.

Consider a spreadsheet or log file: you might want to compare any two given rows, and if they're split across a page break, it's a nightmare.