What is what does ooo mean at work?

OOO (Out of Office) is an abbreviation used to indicate that someone is not available in the office or at their desk because they are away on personal or business matters or taking a vacation. This term is commonly used in emails or other communication to let colleagues know that the person is not in the office and may not be able to respond to emails or calls immediately. It is important to set up an OOO message with the expected return date and contact information for other colleagues who can handle urgent issues in the absence of the recipient.