This is 9V Battery Connector with a 10 cm cable. It is used to connect a 9V battery to the required application. This snap power cable to DC 9V clip male line battery adapter for mostly used to power Arduino boards as well as many development boards.
The connector comes with open-wire at one end and battery connector at another end. It is very good practice to use such a connector in the project as they provide various benefits such as avoid short circuits, No chance of mismatch polarity as wire comes in red and black color, optimum battery use, easy to connect and disconnect the battery to the application, etc.