It means “Post script” and is used to add something at the end of a letter or message that you forgot to add to the actual body of the letter or message.

Example:

Dear Aunt Sally,

I thank you so much for the hospitality you gave me yesterday at your house. I enjoyed the tea and buiscits. Please try to keep in touch with me as much as possible.

Love, Saadia

P.S. I absolutely love the decorations in your house! So exotic!

A postscript (from post scriptum, a Latin expression meaning “after writing” and abbreviated P.S.) is a sentence, paragraph, or occasionally many paragraphs added, often hastily and incidentally, after the signature of a letter or (sometimes) the main body of an essay or book. In a book or essay, a more carefully-composed addition (e.g., for a second edition) is called an afterword. An afterword, not usually called a postscript, is written in response to critical remarks on the first edition. The word has, poetically, been used to refer to any sort of addendum to some main work, even if not attached to a main work

Post Script

Post Script

Post Script

A postscript (from post scriptum, a Latin expression meaning “after writing” and abbreviated P.S.) is a sentence, paragraph, or occasionally many paragraphs added, often hastily and incidentally, after the signature of a letter or (sometimes) the main body of an essay or book.

Post Script.

P.S. or p.s. is the abbrebrevation for ‘postscript’. One word only. From Webster’s New Reference Library, a postscript is a “1. note added at the end of letter, after signature 2. supplement added to book, document etc.”

P.S. mean post script, which in laymens terms means the piece of “script” that you for forgot to write in the the normal “script’ (after the fact) eg… in a letter you write the thing and then forgot to write a bit so after you signed you write P.S. meaning after the fact

Post Scriptum (Latin: Post Script; an additional message after the main body of text in correspondence)