Integration of optics with genetics to control any events within particular cells of living tissue is known as optogenetics. Term 'Optogenetics' was introduced in early 1970's. It is the marriage between optics and genetics to control specific cells of living tissue. This paper introduces the field of optogenetics and its emergence from biophotonics and summarizes the role of optics in the field of optogenetics. This paper also provides a brief survey of some of the ongoing and future research on Optogenetics.