A point is an exact location. It has no size, only position.
Drag the points below (they are shown as dots so you can see them, but a point really has no size at all!)
Points usually have a name, often a letter like "A", or even "W"
The exact location of a point can be shown using Cartesian Coordinates.
Here we see the point (12,5)
Point, Line, Plane and Solid