uncutting:

This is the fancy anatomical term for the head of the penis. Except it’s really not all that fancy; in fact I’d say it’s one of the more well-known anatomical terms.

Anatomically, it’s homologous to the clitoris.

The glans should be fairly sexually sensitive, though less so after circumcision, in which it dries out and develops a layer of keratin. (Bafflingly, one study linked on the Wikipedia page claims this is not the case, completely contradicting thousands of people’s personal experience.) A glans covered by foreskin tends to be slightly moist, and much more response to touch. 

Sometimes it gets inflamed, and we call this balanitis. Often this is touted as a reason to get circumcised, but many cases of balanitis can be cured simply by changing one’s cleaning regimen (you’re actually not supposed to use soap on the glans, or the foreskin for that matter).

The rim of the glans is called the corona, and tends to be very sexually sensitive. Below that, the “groove” where the corona meets the shaft/skin is called the sulcus.