Prelimsverse: Learn about Communication technologies such as Closed-circuit Television (CCTV), Radio Frequency Identification (RFID), Wireless Local Area Network (WLAN)

Communication technologies:

1. Closed-circuit Television (CCTV):

1. Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. 
2. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links.

2. Radio Frequency Identification

1. Radio Frequency Identification (RFID) refers to a wireless system comprising two components: tags and readers. 
2.The reader is a device that has one or more antennas that emit radio waves and receive signals back from the RFID tag. 
3. Tags, which use radio waves to communicate their identity and other information to nearby readers, can be passive or active. 
4. Passive RFID tags are powered by the reader and do not have a battery. Active RFID tags are powered by batteries.
5. RFID tags can store a range of information from one serial number to several pages of data. Readers can be mobile so that they can be carried by hand, or they can be mounted on a post or overhead. Reader systems can also be built into the architecture of a cabinet, room, or building.

3. Wireless Local Area Network

1. A wireless LAN (WLAN) is a wireless computer network that links two or more devices using wireless communication to form a local area network (LAN) within a limited area such as a home, school, computer laboratory, campus, or office building. This gives users the ability to move around within the area and remain connected to the network.
2. Through a gateway, a WLAN can also provide a connection to the wider Internet.
3. They are used for home and small office networks that link together laptop computers, printers, smartphones, Web TVs and gaming devices with a wireless router, which links them to the internet.
4. Hotspots provided by routers at restaurants, coffee shops, hotels, libraries, and airports allow consumers to access the internet with portable wireless devices.

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