-Now that we have reviewed the major strengths of satellite systems, let us have a quick glance at the services of a satellite system. Nowadays, you are immersed in the Internet. Almost all your communication means are more or less linked to the Internet or go through the Internet. But before the Internet, there were telecommunication services already provided by satellite systems. I roughly split them in two parts. First broadcasting services that are the cheapest for a satellite system because economically speaking, a satellite naturally broadcasts. Thus, sending a message to one person or to everyone under the cover exactly costs the same. So if we consider a satellite with an important coverage and natural broadcasting, a broadcasting service is fully adapted. Thus satellites are particularly well-adapted to television services. We more rarely think of other broadcasting services such as radio broadcasting or even data broadcasting to feed caches. The first telecommunication satellite, strictly speaking, that ever existed was Telstar 1. In 1962, it already provided a television service between the USA and Europe. Unfortunately, it used a satellite with a lower orbit than a geostationary satellite. We noticed that when we did not have a fixed relay for broadcasting, it was rather complicated. Thanks to the evolution of launchers, we managed to send a satellite at a distance of 36 000 kilometers from Earth, a geostationary satellite, and create a fixed relay to continuously broadcast television over a large coverage. The higher, the larger the coverage. This is the first type of services, broadcasting services: There is a second type that I called niche services. Niche services are specific services, hence the word "niche". We offer communication means in unusual locations or for contexts in which only satellites can provide this communication. We can think of the interconnection of isolated remote sites, the headquarters of an oil company in a major European city, and its offshore stations for example. To interconnect them, there is nothing better than a satellite system. Storage management in companies spread out all over the world can also be done through a satellite system. You can also consider boats that want to communicate with each other or with their headquarters. In that case, a satellite system can be used. One last example. In the event of natural disasters, earthquakes for example, a satellite system can be deployed rather quickly. You only need to install your transmitter and power generator. You will then be able to transmit and receive information and communicate. These services are specific. Since they are specific, the satellite will be created to provide these services. This will add significant costs. This was before the Internet. Let us now get to the evolution with the Internet.