TTYL means “talk to you later.” It is a standard way to close a conversation without making a firm plan for the next one. The acronym became common in early instant messaging and texting when character limits and typing speed encouraged shorter forms.

People use TTYL when they need to step away but want to leave the door open. It is softer than “goodbye” and less specific than “see you at six.” The phrase works in both friendly and professional-adjacent chats, though full sentences still dominate formal settings.

The four letters remain widely recognized even as messaging platforms have changed. Newer generations still encounter and use it, sometimes alongside more recent closings. Its longevity comes from usefulness. Conversations need exit ramps, and TTYL provides a clean one.

When someone ends with TTYL, the expectation is that contact will resume at some undefined future point. It is a small social contract: this is not the permanent end of the exchange.