When it comes to texting, a wide variety of acronyms, shorthand, and slang terms have become commonplace in conversations. One term you may have heard thrown around is “TYSM,” which stands for “Thank you so much.” This term is typically used as a polite response or acknowledgement of thanks.

TYSM is used as an informal way to express gratitude without having to type out a full sentence. Although it seems curt to some—especially if you’re not familiar with the acronym—it’s a perfectly acceptable way to express appreciation. It may even be seen as more concise and efficient than writing out a full thank-you.

TYSM is used in many different contexts. It’s commonly used to thank people for a compliment or act of kindness, or to express gratitude for something you received, such as a gift. It’s also frequently used in response to favors, invitations, or helpful information.

Usage of TYSM does, however, tend to vary between age groups and cultures. For example, you may be more likely to see it used among millennials, who tend to be more tech-savvy and likely to incorporate modern slang into their conversations. But people of all ages and backgrounds are familiar with the concept of thanking others, so you’re likely to see TYSM used in many different contexts.

While TYSM may be seen as a quick and convenient way to express thanks, it’s important to remember that it’s not always appropriate to rely on acronyms alone. In some situations, such as when thanking a friend or close acquaintance, it may be more appropriate to type a complete response, or even call them on the phone to express your gratitude.

So the next time you want to thank someone for something, consider the situation, and think about how the person may expect to be thanked before going straight for the acronym. And if you do use TYSM in a text, be sure to add a few extra words so your appreciation is clear. Try something like “TYSM, I really appreciate it,” or “TYSM, that means a lot.” With a few extra words, your sentiment can go a long way!