This document defines and provides key details about the equation of a hyperbola. It states that a hyperbola is the set of all points where the absolute difference between the distance to two fixed points, called foci, is a constant. The document outlines that a hyperbola has: 1) A center point equidistant between the two foci 2) Vertices that are the points where the hyperbola intersects the line between the foci 3) Asymptotes that are lines extending from the center point and serve as a guide for graphing the hyperbola.