Speedtest.net shows my internet download speed as 1.08 MBPS but.?

[Ash]

You must be seeing your internet bandwidth. It refers to the volume of information per unit of time that an Internet connection can handle.

Here's a quick analogy: Data is to available bandwidth as water is to the size of the pipe. In other words, as the bandwidth increases, so does the amount of data that can flow through in a given amount of time, just like as the size of the pipe increases, so does the amount of water that can flow through during a period of time.
140kbps is about right