Telling whether you have a female or male connector is fairly easy. As mentioned before, a female connector (also called a jack) comes with a center conductor and a hole. The hole is supposed to accept a pin coming from another wire/cable.
The male connector, on the other hand, is a plug that comes with a pin that's supposed to go inside the center conductor.
You can see these connectors in a wide range of connections, especially those involving signal transmissions. If you get a coaxial cable (also called coax cable), you can get two connector styles: The male connector will have a pin that sticks out of the center, and the female one will have a hole to receive that pin.
Why are they called "male" and "female" connectors, though? The main reason is to distinguish "mating" connectors. These connectors, to work properly, must have an exact match in configuration, number of pins, and size.
Instead of referring to the connectors as "plugs" or "jacks," people find it much easier to simply say the gender, as it's a more universal term.
Most of the time, you will be dealing with female sockets and male plugs. However, some countries have used different designs for their connectors/cables, so you could also see male sockets and female plugs, although it's not as common.
The indicators at SellEton often feature male sockets, while the cables work as the plug, for example.
Overall, the goal of these cables is to establish a connection between two electrical devices. The first device will be responsible for transmitting a signal or power, and the other one will receive that electricity. Moreover, the male/female configuration ensures that the connection is protected from interferences or disconnections.
