A high speed form of internet connection, satellite internet uses telecomm satellites to broadcast internet services, much the same as they do for tv. The added plus to satellite internet is that it can reach remote areas where no other form of internet connectivity is available. Despite this benefit, the performance is not at par with DSL or cable which are much faster. Their happens to be a high network latency because of the delays in transmission from satellite to ground stations. VPN in particular might fail to work along with problems in online gaming.
Older satellite service requires a telephone modem for uploading but all newer ones support data transmission both ways. It is much different from WiMax although it may sometimes use WiMax, however the two should not be confused as satellite operates differently.