"PS" stands for "postscript," which comes from the Latin phrase post scriptum , meaning "written after." It is used to add an additional thought, comment, or piece of information at the end of a letter, email, or message after the main body and signature

. Originally, when letters were handwritten or typed, a PS was added if the writer remembered something after finishing the letter, allowing them to include the extra information without rewriting the entire message. Today, it is commonly used in both personal and professional communication to emphasize a point, add a reminder, or include a call to action, especially in emails and marketing communications

. The abbreviation is always capitalized, and it can be punctuated as "P.S." or "PS," often followed by a colon or dash, though punctuation styles vary

. In summary:

• PS = Postscript
• Origin: Latin post scriptum ("written after")
• Usage: Additional note after the main message and signature in letters, emails, and texts
• Purpose: To add afterthoughts, emphasize points, or provide reminders