The document discusses the basic components of verticality for defenders and offensive players in basketball. For defenders, they must establish a legal guarding position, can jump vertically within their plane, and should not be penalized for leaving the floor or having hands/arms extended vertically. Defenders also may not use their lower body to cause contact. For offensive players, they may not clear out or cause contact in the defender's vertical plane and are given no more protection than the defender in judging violations. The document provides examples of legal and illegal verticality plays.