MPConnector (Modular Power Connector) is a serie of breakout boards carrying power connectors such as jack (in various sizes), usb-c, micro usb, mini usb.. They share the same pins and form factors to be easily placed and hand-soldered on your circuit.
To ease the soldering phase, the boards has castellated pins.
NOTE for production: you must set "castellated hole" when ordering on JLCPCB. This...