Most people in the UK access the internet using broadband because it’s much faster than the other methods. Broadband access allows feature rich web pages (ones that have lots of graphics, videos, sound, animations etc) to download quickly and it allows users to quickly download large files (like music or video clips). Faster internet connections also mean that the response time between clicking on a link and the new page appearing are reduced.
The download times are calculated based on each connection's maximum theoretical download speed.
ISPs advertise speeds as 'up to', for example, 'up to 8 Mb'. This means that the maximum speed you will achieve is 8 Mb but that you're unlikely to achieve 8 Mb all the time.