How are planes different from lines in 3D geometry?

Sunil Kr: How are planes different from lines in 3D geometry?
I am in class XII facing 3D geometry for the first time.I am really confused about planes as their equations are similar to that of lines in 2D geometry.

Answers and Views:

Answer by Jeff
Planes, unlike lines, are two-dimensional. Lines are one-dimensional. Although the equation of a plane, Ax + By + Cz + D = 0 is similar to that of a line in 2D geometry, keep in mind that is a normal vector to the plane in 3D.