What does 'keep me in the loop' mean?

What it means: To be kept informed about a situation, project, or decision as it develops.

"Please keep me in the loop on this."
"I'm out of the loop — what happened?"

The image: A loop is a closed circle. Being "in the loop" means you're part of the circle of communication. Information flows around the loop and reaches you. Being "out of the loop" means you're outside it — information passed you by.

• "Keep me in the loop" — ask to be kept informed
• "Out of the loop" — not informed, missing information
• "Loop them in" — include someone in communications (same concept)

• "Keep me posted" — similar, more casual
• "Keep me updated" — clearer
• "Make sure I'm informed" — formal

Register: Professional. Very common in workplace communication.

Tags: business English, communication, workplace, idioms