What is Backstabbing a Receptacle or Switch and why is it

Have you ever experienced a burning smell or the smell of plastic melting coming from an outlet or receptacle in your home or business? This is a cause for concern because electric and fire can be related.

new construction guys, why do you stab in? : r/electricians

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Backstabbing: electrician says all outlets in home should be replaced?

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Back-Stab Switches and Receptacles

electrical - How do I re-wire this outlet (switched top, always-on lower)? - Home Improvement Stack Exchange