Knowledge of connectors (3)

First, the structure of the connector
The basic structural parts of the connector are: 1 plastic case; 2 terminals; 3 pin holder & Other

Wire to wire connection structure:

Wire to board connection structure:

Board to board connection structure:

Second, the board end needle classification:

        Wafer
        By type to distinguish as below:
        DIP                            SMT
        By assembly to distinguish as below:
        90 degrees                 180 degree

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        DIP 
        180 degrees: 
        90 degrees:

        SMT
        180 degrees: 

        90 degrees: 

The above is all about connector, thank you for watching.