Edge Detection Is Method of Image Processing Edges Define the Boundaries and Helpful to Segment the Object, Registration, Feature Extraction and Identification of Objects In a Scene and Reduces the Amount of Data and Filters Out Useless Information So That Edge Detection Is Significant Field In Image Processing In This Paper Different Method For Edge Detection Are Discuss. Edge Detection Methods For Edge Detection Are Canny’S Method, Laplacian of Gaussian (Log), Prewitt, Robert, Sobel. the Advantages and Disadvantages Are Also Studied In This Paper. Application Area of Edge Detection Is Very Wide I.E. from Astronomy to Photography, Medicine to War Etc.