The main difference in the phenomenon of interference and diffraction is that:
Diffraction is due to interaction of light from the same wavefront whereas interference is the interaction of waves from two isolated sources.
Diffraction is due to interaction of light from same wavefront, whereas interference is the interaction of two waves derived from the same source
Diffraction is due to interaction of waves derived from the same source, whereas the interference is the bending of light from the same wavefront
Diffraction is caused by the reflected waves from a source whereas interference is caused due to refraction of waves from a source
Conceptual