The connector can be understood as a component that can be quickly connected with male and female terminals by hand insertion or screwing without tools, and is mainly used for the connection between circuits. In industrial production, line connection can be said to be ubiquitous, so the scope of use of connectors is certainly very wide, applied in various industries.

Connectors are divided into many categories, such as rectangular connector, circular connector, hard city automobile connector, ladder connector, etc.

The connection terminal is generally a rectangular connector, which requires tools, such as a screwdriver, to connect two components together. The categories include spring terminal, screw terminal, PCB board terminal, hardware terminal, etc. It is generally used in the electronic and electrical field, for the internal and external wiring of power distribution cabinets, PCB circuit boards and printed boards, such as hard city spring terminals and UK screw terminals.

The difference between connector and connector is that the latter is the connection between lines, and the former is the connection between lines and boards and boxes.

In general, "connector", "terminal block" and "connector" belong to different application forms of the same concept and are commonly called according to different practical applications.