When it comes to selecting one mode (or state) from multiple modes (or states) to operate a device , rotary switches turn up as one of the most exemplified type of switch. Some well known applications of rotary switches include speed control in fans, speed control in conveyer belts, selecting time, frequency on the CRO, step control of AC/DC drives and electro-hydraulic valves. These switches can be thoroughly customized depending on applications.  But what makes these mechanical switches able to deliver multiple types of outputs? What structure they have to accommodate so many output stages? How are they able to avoid the size and cost trade-off? This article will explore answers to many more interesting questions.