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Non collinear points are not all located on the same line. You can not draw a straight line through all three of them. That's about it. ;)
Yes, any points that are located on the same line will also be on the same plane. You can have more than one plane intersect a given line, but any points on that line will necessarily be on all the planes that intersect that line.
Collinear set of points
Yes, of course! By definition a line is a planar figure, and all the points of the line are therefore coplanar.
A line through many points with the same air temperatureis an "isotherm".The "isobar" is a line through many points with the same air pressure.