In his 1920s work Psychological Types, Swiss psychiatrist Carl Jung popularized the terms "introverted" and "extroverted" describing personality types. Introverts recharge by spending time alone, and they lose energy if they're around people for long periods. Extroverts, on the other hand, gain strength from social interactions and actually exhaust themselves if they're alone. Both of these types have their good and their less perfect qualities, so there's no point in arguing which side would win in the Introvert VS. Extrovert battle.
To help you fully grasp the concept, Bored Panda has compiled a list of funny memes that are as relevant to the subject as they're entertaining. And if you start nodding in approval with these introvert quotes, you're probably more of this type of person. If not, you're most likely that party animal they try to avoid. But before you judge, one group or the other, remember something Jung has said, "There is no such thing as a pure introvert or extrovert. Such a person would be in the lunatic asylum." Continue scrolling, and enjoy the introvert memes!