Becoming Familiar With My Camera

Name: Canon PowerShot SD1100 Digital ELPH
Megapixels: 8

Ten things that I learned:
1. There is optical image stabilization that makes pictures more clear and focused.
2. Like a lot of other digital cameras these days, mine has a face detection feature.
3. My camera has a 3x optical zoom feature.
4. There are eight different shooting modes for my camera: auto, manual, digital macro, portrait, night snapshot, color accent, color swap, and special scene mode.
5. The lens on my camera has a focal range of 6.2-18.6 mm.
6. The maximum lens aperture on my camera is between F2.8 and F4.9.
7. To go along with the face detection feature, my camera has a "primary face" setting that allows the camera to track a certain face as it moves around the frame.
8. The Canon PowerShot has a continuous shooting mode that allows you to take pictures at 1.3 frames/second.
9. In the special scene setting, there are lots of other modes such as kids and pets, indoor, sunset, foliage, snow, beach, fireworks, aquarium, and underwater.
10. There are three focus modes to my camera. Face detection, AiAF, and center point.

Three questions that I still have:
1. The term telephoto was used a lot, what does that mean?
2. Can you change the shutter speed? If so, how?
3. What is AiAF mode?