What is French philosopher Jean-Paul Sartre's famous quote "Hell is other people" most commonly interpreted as?

"Hell is Other People." That's actually a famous line from French philosopher Jean Paul Sartre's 1944 play, "No Exit." In the play, three characters arrive in Hell. They're expecting flames and pitchforks, but instead they're shown into a plain ordinary room - and then gradually discover that this is where they'll be spending eternity. Alone, together. Which is where that famous line comes in.

In other words, there is no physical torture that awaits them: it's the emotional and mental torture of having to relate with other humans that makes that place hell (which, in its description throughout the play, resembles the real world).