Blender Tutorial : How To Use Hook Modifier

This Blender Tutorial is about how to use Hook Modifier in Blender. Generally The Hook modifier is used together with Shape Keys to control the deformation of a Mesh or a Lattice using another object (usually an Empty but it can be any object. Specially Beginners have issued with these problems and they are confused how to use hook Modifier in Blender.
As the hook moves, it weighted-pulls vertices from the mesh with it. If you have used proportional editing, you can think of it as animated proportional editing. While hooks do not give you the fine control over vertices movement that shape keys do, they are much simpler to use.