WOW! NAKED PICTURES.
Telephone Biology 101: what's the difference between a plug and a jack?

The little plastic tips on the ends of phone cords are plugs. Plugs fit into jacks.

Despite their male name, jacks are female. Plugs are male. Plug and penis begin with the same letter.

That should be easy to remember, but lots of people get it wrong. Some folks talk about "jacking in," instead of "plugging in." Google shows over 60,000 links for the phrase "jacking in." That's stupid. Lots of electricians call (female) electrical outlets, plugs. That's even more stupid.

If you don't understand hardware gender, find someone of the opposite sex, get naked, and look in the mirror. Or study Michelangelo's "Temptation and Fall" on the Sistine Chapel ceiling in Rome.

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"Modular" phone plugs are made in three standard sizes. The smallest plug, known as 4-position/4-wire, is used for handset cords. The middle-size plug is the most common. It has six positions, and either two, four, or six wires. It is used for most line cords, for connecting phones, modems and other devices to phone jacks. The largest plug, with eight positions and eight wires, is usually used for LANs (Local Area Networks) and sometimes for four-line phones.