1: Interference is due to the interaction of light coming from two different WAVEFRONTS originating from the same source. 1:Diffraction is due to interaction of light coming from different parts of the same wavefront. 2:Interference fringes are of the same width. 2:Diffraction fringes are not of the same width.3: Interference occur due to interaction between primary wavefronts originating from two coherent sources .3: diffraction is the result of interaction between two secondary wavelets originating from two different points of same wavefront. 4:interference is a phenomenon in which two waves superimpose to form a resultant wave of greater or lower amplitude. 4:diffraction phenomenon is described as the apparent bending of waves around small OBSTACLES and the spreading out of waves past small openings.5: example, the CLOSELY spaced tracks on a CD or DVD act as adiffraction grating to form the familiar rainbow pattern seen when LOOKING at a disc.5:examples of interference is demonstrated by the light reflected from a film of oil floating on water. Another example is the thin film of a soap bubble, which reflects a spectrum of BEAUTIFUL colors when illuminated by natural or artificial light sources.