What is the difference between geometry and geometryZ?

Question

I saw some databases in Postgres/PostGIS which contains 2 different fields types:

geometry

and

geometry(GeometryZ)

• What is the different between those 2 ?

Answer 1

one accepts a 2d coordinates Point ( x y) the other 3d coordinates Point ( x y z)

There are also 4d coordinates in postgis

https://postgis.net/workshops/postgis-intro/3d.html