Joy-Con is a mix-and-match controller for the Nintendo Switch. The Nintendo Switch Lite doesn't have any Joy-Cons. The Nintendo Switch OLED has glacier-white Joy-Cons. Joy-Cons are known for 'drifting'. There is special alternative to the Joy-Con that can be used in Pokemon: Let's Go Pikachu! or Pokemon: Let's Go Eevee! called Pokeball Plus.
Joy-Con, Smashpedia
Joy-Con - NintendoWiki
Nintendo Switch - Wikipedia
Joy-Con - Zelda Wiki
Nintendo Switch - Wikipedia
Joy-Con, Wikitroid
Wikitendo Wiki
Joy-Con - Wikipedia
Wikitendo Wiki
Nintendo Switch - Wikipedia
Nintendo Switch (OLED Model)/Gallery, Wikitendo Wiki
Every Nintendo Switch Joy-Con Controller