Three non-collinear points always define exactly one and only one plane.
That's why a 3-legged table or chair never wobbles.
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Collinear points are points that lie on the same line, while coplanar points are points that lie on the same plane.
They are lines or points that lie on the same plane. Remember 3 or more points are collinear if they lie on the same line. IF those lines lie on the same plane they are coplanar.
-lie in the same plane -are collinear
yes
Yes. In fact any three points that are not collinear define a plane and therefore MUST lie on a plane.