Ellipses
An ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.
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Ellipses contain two foci (singular: focus). Ellipses share a property that the sum of the distances from each focus to the edge of the ellipse is constant across all points of the ellipse - in a sense, it is a “radius” formed by two points.
All circles are ellipses but not all ellipses are circles.
An ellipse can be derived also from a conic section, with a titled plane.