Analogy: When you were young, you played clay. You poured water on the top of a small mound. The water flowed away from it. Many of the water leaked into the soil or flowed in different directions. Some of the water flowed to a low-lying place through different paths and different times.
The multipath effect of radio waves means that the signal often has many transmission paths with different delays and different losses from the transmitting end to the receiving end. It can be direct, reflected or diffracted. The same signal of different paths is superimposed at the receiving end. It is the phenomenon of increasing or decreasing the energy of the received signal.
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