Male has a sticking out “pin” which he plugs into something. The Females on the other hand have a “hole” in which to receive something, usually a “pin”!
Connectors are used to join subsections of circuits together. Usually, a connector is used where it may be desirable to disconnect the subsections at some future time: power inputs, peripheral connections, or boards which may need to be replaced.
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Why are connectors called male and female?
Outdoor Waterproof IP68 4-Way Line M20 Electrical Cable Connector Wire Range 5-12mm Power Cord External Sleeve Coupler Protection.
The waterproof inline connectors are intended for use in permanent electrical installations wich require a full protection against damp and water. The panel mount connectors, used together with the pluggable inline connectors, are intended for equipment interconnexion under IP68 made in a fast, safety and reliable way.