Bandwidth is a measurement of the amount of data that can be sent over a network in a period of time. The more bandwidth available, the faster the internet data can travel and therefore the faster the internet connection can be.
Think of a small drinking straw compared to a large straw, you can get more liquid at a time through the larger one. So, the faster the internet connection, the faster web pages will appear, the faster you can download songs and movies, you should get where I'm going with this.
That's bandwidth, so now let's look into how this affects your quota. Quota is the main reason our plans cost different amounts of money. In essence, you are buying a piece of iiNet bandwidth. The more quota you purchase, the more bandwidth you will have.
Visit iiHelp for more information on quota.