VSAT is a satellite communication system that uses small antennas, typically 1-3 meters in diameter, to connect to satellites. It has two main components: an outdoor unit including the antenna and radio equipment, and an indoor unit that interfaces with user equipment. VSAT networks consist of a central hub station, geostationary satellite, and multiple remote VSAT terminals. The hub station manages the network and transmits data to the satellite at high speeds, which then broadcasts the signals to the remote VSATs. VSAT networks provide cost-effective, flexible connectivity and can support voice, video, and data transmission for applications like credit verification, stock control, and video conferencing.