Difference Between Diffraction and Interference

Waves that originate from two different, coherent sources produce the property termed as Interference, whereas secondary wavelets that originate from the same wave but occur from different parts of it, produce a phenomenon termed as Diffraction. These both sound alike however they are entirely different by nature. Understanding the resolving power of telescope and microscope can be useful.

Difference between Diffraction and Interference
Interference Diffraction
Interference may be defined as waves emerging from two different sources, producing different wave fronts. Diffraction on the other hand can be termed as secondary waves that emerge from the different parts of the same wave.
In interference the intensity of all the positions on maxima are of similar intensity in interference. In diffraction, there is a variance of the intensity of positions.
The width of the fringes in interference is equal in interference. The width of the fringes is not equal in interference.
It is absolutely dark in the region of minimum intensity, in the case of interference. In the case of diffraction, there is a variance in the intensity of interference.
If the number of sources are few such as two sources, then they are referred to as interference sources. If the number of sources are many, that is more than two then it is referred to as diffraction sources.