Contention is the number of people who are sharing the same bandwidth/line as you. That's why you sometimes find that download speeds are better in the daytime than at peak times.
Throttling is where the ISP will restrict the maximum transfer speed.
Think os a torrent, how you can Cap the upload or download speed, that's essentially what the ISP does when they throttle a connection.
Edited by Arcolite (Thu 22-Mar-07 19:20:10)