The term "ttyl" stands for "talk to you later." It is commonly used in texting and online communication to indicate that the conversation is coming to an end but the speaker intends to continue the conversation at another time. It's a casual and friendly way to say goodbye without implying that the interaction is over for good.
"TTYL" is an abbreviation that originated in the early days of internet chat and text messaging. It likely emerged in the 1980s as part of the growing phenomenon of digital communication, where people began to use shorthand to convey messages quickly.