What is OP_RETURN in simple english?

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Alright, let's break it down. OP_RETURN is like a memo space on a Bitcoin transaction.

You know how when you write a check, there's usually a line where you can note what the payment is for? OP_RETURN is kinda like that!

But remember, anything you put in an OP_RETURN gets etched into the Bitcoin blockchain forever - so use it wisely!

Is that's what they meant,when they say putting messages on transactions?Are most transactions in OP_RETURN status?