Comics became popular in the early twentieth century. Comic strips were used in newspapers for conveying humorous themes. Images are sequentially used in comics to convey the meaning to the reader. Speeches are also incorporated along with pictures and they are placed within picture balloons. With the wide spread acceptance of public, comic books gained popularity rapidly, especially in countries like Japan. The theme has become more diverse giving stories of super heroes, stories of adventure, romance and wars. Now they have become the main source of entertainment for the children as well as the elderly. Comics are made available in the internet as web comics.