1) Radio terminology 
A spot beam, in telecommunications parlance, is a satellite signal that is specially concentrated in power (i.e. sent by a high-gain antenna) so that it will cover only a limited geographic area on Earth. Spot beams are used so that only earth stations in a particular intended reception area can properly receive the satellite signal. One notable e...
a satellite antenna beam, the footprint of which is much smaller than the part of the Earth that is visible from the satellite
A spot beam is a satellite transmission that is focused on a specific area within the footprint, or