You have a fun rabbit hole to go down!Explain?!?
Long story short, a few hedge funds short sold massive amounts of Gamestop stock. Far more than they should have been able to. A loose army of normal folk caught wind and started pumping all of their cash into the stock, causing the share price soar. It went from $20 a share about a week ago to about $390 earlier today. The hedge funds have lost billions, they were effectively beaten at their own game.
I wish I had jumped in earlier. It's been fun to watch.