Canon makes several series of non-SLR digital cameras; each line of cameras begins with a letter-number designation. The A series is the entry-level tier; they're the least expensive but they also lag in features. The Sx00 Elph series is the most compact. The Sx series is mid-tier—larger and more powerful. The G series is the top: it has a lot of the EOS features but lacks interchangable lenses.
This is one of the early Canon point-n-shoot digitals, along with the A10. I got it from a friend who retired her old cameras.
For more information: Canon Camera Museum
Camera manual: Orphan Cameras.com