This document discusses hyperbolas and how to sketch them. It defines a hyperbola as the set of points where the difference between the distances to two fixed foci is a constant. It provides the equations of horizontal and vertical hyperbolas with their vertices, asymptotes, and foci. Finally, it outlines the four steps to sketch a hyperbola: 1) sketch the central box, 2) draw the asymptotes, 3) plot the vertices, and 4) sketch each branch approaching the asymptotes.