This document discusses parabolas and provides examples of writing equations of and graphing parabolas given characteristics like the vertex, focus, and directrix. It defines a parabola as the set of all points equidistant from a fixed point (the focus) and a fixed line (the directrix). Examples show how to find the equation of a parabola with a given vertex and focus, graph parabolas, and solve applied problems involving the reflective properties of parabolas.