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.

It seems like only yesterday we were talking about why we don't like backstabbing receptacles. : r/AskElectricians

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Electrical Outlet, Ground Fault Receptacle

WHAT ARE BACKSTABBED OUTLETS? (and why they're not okay!) // Star Tips Ep.001

Is it okay to use both the backwire holes and the side terminals on an electrical outlet? - Quora

What does it mean if an electrical outlet is 'backstabbed'? - Quora

electrical - What is the cause of this short in the outlet receptacle? - Home Improvement Stack Exchange

Santino Electric

Installing new switch - 3 black wires to 2 connections - Community Forums

When did people realize that backstabbing was a bad idea? Found an outlet circa 1966 that ONLY has backstab connectors (no terminals) : r/askanelectrician