"Joker" appears in many games but isn't a standalone game title. You likely mean one of these:
| If it's... | It's probably... |
|---|---|
| Shedding, UNO-like, Joker = wild/skip | Commercial "Joker" shedding game |
| Trick-taking, bidding, Joker = super-trump | Euchre/500 variant |
| Melding sets/runs, Joker = wild | Rummy/Canasta variant |
| Poker hands, Joker = wild | Joker Poker / Wild Poker |
| Board + marbles + cards | Parker Brothers "Joker" (1970s) |
With details, I'll give exact rules. Most "Joker" games are variants of standard games with Jokers added!