Lattice object is a global deformator object. Create it into an object and all the geometric points in the object are influenced by the lattice object.

The lattice object can be used as a deformation tool for modeling purposes, or as an animation tool. When activated, the tool provides three integer fields which define the point counts in three dimension.

Lattice applied to a SDS sphere
Number of points in x, y and z dimensions

One can create a lattice over any object and deform it to deform the target object.

A SDS sphere deformed by a lattice object

You can also move an object through a deformed lattice object to get a deformation effect applied.

Lattice object properties are explained in models/geometrics/lattice documentation.

A SDS sphere moving through a lattice