Topic summary
Guitars

Extracted from the Wikipedia article Guitar.
Types
Guitars are often divided into two broad categories: acoustic and electric guitars. Within each category, there are further sub-categories that are nearly endless in quantity and are always evolving. For example, an electric guitar can be purchased in a six-string model (the most common model) or in seven- or twelve-string formats. An instrument's overall design, internal construction and components, wood type or species, hardware and electronic appointments all add to the abundant nature of sub-categories and its unique tonal & functional property.