I want to know the answer to the following question:
What is one system that uses electromagnetic waves?
All the background I'm provided with is that "Radio transmitters and receivers are used to convey signals (information) in systems including broadcast (audio) radio, television, mobile telephones, Wi-Fi (WLAN) data networks, trunk lines and point-to-point communications links (telephone, data networks), satellite links, many remote controlled devices such as garage door openers, and wireless remote sensors, among many others.". Is that enough to answer the question?