Episode DPT-101 Rick Sammon covers the lowdown on all the different types of film. When you take a picture, you're simply recording light on film.
Film comes in many types, each geared for specific lighting situations and tasks.
Slower-speed films give you sharp pictures in very bright light. To be prepared for any type of shot or lighting conditions, carry several different kinds of film. For maximum color stability and long life, store film in the refrigerator until you are ready to use it. Use this film in bright, sunny situations. A good general-purpose film.