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Can I use a 15 amp plug in a 20 amp circuit?

If you've got a 20-amp circuit or receptacle, you may be curious if you're able to attach a 15 amp plug to it. The answer? It depends on a few circumstances.
Ars Technica

UPS Utility Power Questions - 15Amp - 20Amp

We just got our new UPS in and it has a 120v 20Amp NEMA 5-20P plug on it. Our outlets are 120V 15Amp NEMA 5-15P. My question is: Is an adapter plug a bad idea? Or should I have an electrician come in ...