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Familiar from such everyday activities as getting food in cafeteria where one processes one person per "clock cycle" where
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clock cycle here is maximum time anybody takes at a single "stage" where stage is here component of meal (salad, entrée etc.)
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Note any one person takes about 5 clock cycles in this pipeline but the pipeline processes one person per clock cycle
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Pipeline has problem if there is a "stall" -- here that one of the people wants an entrée which needs to be fetched from kitchen. This delays everybody!
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In computer case, stall is caused typically by data not being ready for a particular instruction
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