What exactly means premultiply by alpha?

Hallo, guys!
Please, can someone help me? I don’t exactly understand what means PREMULTILPY and POSTMULTIPLY by alpha. What do these functions with image? I know this isn’t related explicitly to Fusion, but I’d like to know this.. In Fusion you can find "postmultiply by alpha" in any tool containing alpha channel.

Thanx.

B

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