Another confusing thing about shopping for internet is when you see speeds listed like this:
5/1 Mbps
What does this mean? Well, that means that internet plan has a download speed of 5 mbps and an upload speed of 1 mbps.
The reason why your upload and download speed are different is because most internet connections are asymmetric. In English this means that the bandwidth is a different size going one way compared to the other. Since most users consume content rather than upload it, the bandwidth for download speeds is larger (than the upload).