What is the difference between diffraction and scattering?

How one can differentiate between scattering and diffraction?
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"Diffraction occurs at the edge of an impenetrable body that is large compared to the wavelength of the radio wave. The edge in effect become a source and waves radiate in different directions from the edge, allowing a beam to bend around an obstacle. If the size of an obstacle is on the order of the wavelength of the signal or less, scattering occurs. An incoming signal is scattered into several weaker outgoing signals in unpredictable directions."
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"Scattering is a process where waves are deviated due to certain anomalies in the space. Forms of radiation such as light, sound and even small particles can be scattered. The cause of scattering can be a particle, a density anomaly, or even a surface anomaly. "
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