A wireless system is a communication system used to send and receive data or signals between two or more devices, without the need for any physical connections such as cables. Wireless systems use various technologies such as radio waves, microwaves, satellites, and infrared to transmit information. Some of these wireless systems include cellular telephone networks (such as 2G, 3G, and 4G LTE), wireless local area networks (WLAN), and satellite communication systems.
2G, 3G, and 4G LTE cellular networks are used to provide mobile phone services and support various data services such as web browsing, email, and streaming video. 2G networks use digital technology for voice communication and support basic data services, while 3G and 4G LTE networks provide higher data speeds and support for more advanced data services.
Wireless Local Area Network (WLAN) is used to connect devices within a limited distance, such as homes, offices, and cafes. The most commonly used WLAN technology is Wi Fi, which is used to provide wireless Internet access for devices.
Satellite communication systems are used to send and receive data between remote devices on Earth. These systems use Earth orbiting satellites as relays to send information to receivers on Earth. Satellite communication is used for various applications, including television broadcasting, aviation and navigation, and Internet access in remote areas.