An asterism in Sagittarius, formed from 14 stars. Not one of the 88 constellations.
Once you see the teapot you cannot unsee Sagittarius as an archer again. The Milky Way rises from the spout like steam, which is a genuinely useful way to find the galactic centre.
The Teapot is centred near right ascension 18.6 hours, declination -29°. It lies south of the celestial equator and sits low for northern observers, better the further south you go.
The International Astronomical Union recognises 88 constellations, and they divide the whole sky between them like countries on a map. The Teapot is not one of them — it is a pattern picked out of Sagittarius. That makes it an asterism: a shape people recognise and name, with no official standing whatsoever.
The distinction matters less than it sounds. Asterisms are usually easier to find than the constellations containing them, which is exactly why they survive.
SkyRef can draw the Teapot in its real position for wherever you are — switch on the asterism layer and it appears dashed across the constellations it runs through.