PS in chat stands for "postscript," derived from the Latin phrase "post scriptum," which means "written after." It is used to add an afterthought, additional information, or an extra comment after the main message has been sent or written. In chats, emails, letters, and texts, PS is often placed at the end as a way to include something the sender forgot to mention earlier or wants to emphasize without rewriting the entire message. For example, in a chat conversation, someone might say:
"See you at the party on Friday?"
And then add after the main message:
"PS: Don't forget to bring the snacks." In short, PS is a way to add something extra after the main content of a message or conversation has concluded. This usage is common in digital communications as well as traditional letter writing. It helps highlight additional points, reminders, or personal notes after the main text.