Endodontic treatment involves cleaning and shaping the canal using stainless steel hand instruments. However, using these hand instruments made the treatment time-consuming, cumbersome for the clinician and the risk of instrument breakage is also more. To overcome this situation, rotary endodontics are introduced to increase the success of the treatment with the ease of operating rotary nickel-titanium files. These rotary files are continually evaluating in the form of their design features, how instruments are driven such as rotary or reciprocating. The purpose of this review is to provide a knowledge base for nickel-titanium rotary use and further aims to give a brief insight into the different design and features of various rotary instrument systems enabling them to select a system that is most suitable for their needs.