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It is the locus of points such that the sum of their distance from two distinct fixed points is a constant.
It is the locus of a point such that the sum of its distance from two (distinct) fixed points is a constant. So, given two fixed points, F1 and F2, an ellipse is the locus of the point P such that PF1 + PF2 is a constant. That would be an ellipsoid, a 3 dimensional thing. The 2 distances have to be measured in a fixed (2 dimensional) plane.
It is a line segment.
They are points whose positions do not change under transformations.
Facts assumed to be fixed or true from which inferences are drawn and opinions formed