👉 In mathematics, an interior point is a point in a space that is "inside" or "in the interior of" another set. It is often used to specify points that lie on a boundary line or are part of a closed curve. For example, if we have a rectangle with sides 3 units long and 4 units wide, then the interior of the rectangle would be all points inside the rectangle except for the corner points (the point at which the two sides meet). In this case