Understanding the Role of Diffraction in Signal Interference | Explained Simply

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Diffraction plays a significant role in signal interference, particularly affecting electromagnetic waves. It can be beneficial for transmitting signals along the Earth's surface, but it also leads to destructive interference when two radio waves of the same frequency are out of phase, resulting in a null signal. This phenomenon can cause areas where radio reception is poor or nonexistent. Visible light diffraction creates distinct patterns, such as bright and dark lines or concentric rings, which illustrate the effects of diffraction. Understanding these principles is crucial for optimizing signal transmission and reception.
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Hi i am wondering how the diffraction interferes with the signals.. I was reading wikipedia's diffaction artiocle .. bt i can't understand clearly what diffraction causes to an e/m wave.. What i know is that the diffraction is bad some times os some other times is good because we can send waves using diffraction with the Earth's surface...
 
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The problem arises with destructive interference. If two radiowaves have the same frequency, but are 180° out of phase at some point, then the combined radio signal will be nil, and a radio at that location will be unable to reproduce the radio transmission.

One can see diffraction patterns with visible light with alternating bright and dark lines or concentric rings corresponding to linear (line) or concentric circular diffraction gratings.
 

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