Multimedia is defined as the integration of various media types including text, graphics, images, audio, and video. The document discusses several applications of multimedia such as in education, entertainment, medical services, public places, and multimedia conferencing. Specifically, multimedia is used for educational purposes by allowing students to learn and explore knowledge from any location through e-learning. It is also widely used for entertainment through various media like games, TV, online newspapers, and videos. Medical services have been impacted by multimedia which enables demonstrations of the human body for student training and medical investigations.