RJ45 is a kind of information socket (ie communication terminal) connector in the wiring system. The connector is composed of a plug (connector, crystal head) and a socket (module). The plug has 8 grooves and 8 contacts. RJ is the abbreviation of Registered Jack, which means "registered socket".
Homyet Parts offers a large selection of RJ45 connectors, you can browse our product and ask for the samples.