The cloth solver simulates deformable surfaces. A variety of surface types can be simulated, including fabric, rubber, and metal. Any piece of SOP geometry can be turned into a cloth object, no triangulation is required.
See relationships for how to make cloth interact with other objects.
Useful cloth object parameters
The resistance to stretching. Higher numbers mean the cloth is harder to stretch.
Resistance to shearing (forces along the plane of the cloth; if you stretched a square into a parallelogram that force would be shearing). This affects creasing where cloth is draped over a corner, as in a tablecloth on a table.
Increase this to make the cloth smoother/more resistant to wrinkles.