[header] How to buy a circular saw [title] See what is available for you to buy. [step] You will find there are three types of circular saws. The differences are based on how they operate or how the saw blade is turned as well as how they are powered. 
[substeps] The direct drive, or sidewinder, is the saw you are probably the most familiar with. This saw, with the blade attached directly to the motor, is powered by 110 house current and normally is the least expensive of the three types.