In an ellipse, the longer axis is called the major axis and the shorter axis called the minor axis . Vertices are the endpoints of major axis and co-vertices are the endpoints of minor axis.
The midpoint of major and minor axis is known as the centre of ellipse.
Foci are the the two points on the major axis of the ellipse such that sum of distance of the foci from the point on the ellipse is constant.
Foci basically lie on the major axis.
So, the given statement ''the focus of an ellipse lie on the major axis of the ellipse'' is true.
