This document discusses various applications of computer graphics including computer-aided design (CAD), visualization, animation, and computer games. It then describes the frame buffer, which stores pixel information for the screen in memory. Finally, it explains two basic line drawing algorithms - the digital differential analyzer (DDA) line drawing algorithm and Bresenham's line drawing algorithm. The DDA algorithm calculates pixel coordinates by incrementing x or y values based on the slope of the line, while Bresenham's algorithm optimizes for integer coordinates.