"TY" is an acronym that stands for "Thank You". It is a shorthand way to type "thank you" and can be all lowercase ("ty"), uppercase ("TY"), or capitalized ("Ty") . It is commonly used over text and on all social media platforms like TikTok, Twitter, Instagram, Facebook, Snapchat, and more. "TY" is a casual abbreviation and wont appear in formal communication, like in an email to or from your boss.