A point constraint causes an object to move to and follow the position of an object, or the average position of several objects. This is useful for having an object match the motion of other objects.
You can also use a point constraint to animate one object to follow a series of objects.
See Create point constraints and Constrain > Point.
In animation, a constraint that matches the orientation of one object to one or more other objects. Orient constraints are useful for keeping objects aligned.