The terms upload/download, upstream/downstream and uplink/downlink are used interchangeably. The uplink and downlink speeds between LAN computers is about the same. But speeds vary for individual and business customers who need internet.
For consumers, the uplink speed doesn't need to be as fast as the downlink speed. If an individual wants to download a video, the request is composed of simple text. The video download, however, could be several gigabytes. ISPs typically offer plans that have low uplink and high downlink speeds.
For businesses, the uplink and downlink speeds are equally important. Businesses with multiple locations and international partners, for example, need to be able to send and receive large files quickly. Hence, ISPs offer a considerably more expensive internet plan that delivers the necessary speeds.