What is RJ45 and what are its uses?

 RJ Connectors are a family of push-and-click connectors for twisted-pair wiring in telephone and network wiring. RJ stands for Registered Jack. RJ types define both a jack or receptacle (female) and a plug (male) type of connector.

The most common types of RJ connectors are as follows:  RJ-11 connector: A 4-wire or 6-wire telephone-type connector   RJ-45 connector: An 8-wire telephone-type connector    RJ-48 connector: An 8-wire telephone-type connector TP.