Edge discovery alludes to the way toward recognizing and finding sharp discontinuities in a picture. Edge is the territory of real change in the picture power or complexity and Edge Detection is finding zones with solid force contrasts We utilize edge detection– in light of the fact that it helps in separating data about the picture, e.g. area of articles introduces in the picture, their shape, measure, picture honing and upgrade. Edge recognition is utilized for picture division in view of sudden changes in power. In a nonstop picture, a sharp power change between neighboring pixels is considered as an edge. This paper presents a review on edge detection techniques. This paper also describes process and methods of edge detection.