What are three or more points that lie in the same plane?

Three or more points lie in the same plane if they can be connected by a flat surface without any bending or curvature. For example, the points A(1, 2, 3), B(2, 3, 4), and C(3, 4, 5) are coplanar because they can be contained within a single flat surface. Additionally, any three points that are not collinear (not all on a single straight line) will also define a unique plane.