OP_RETURN in Bitcoin is a special command (opcode) that lets you embed small amounts of arbitrary data (text, files, etc.) into a transaction, creating a special "unspendable" output that effectively burns any Bitcoin sent to it, allowing for things like timestamping, token creation (like NFTs), and digital signatures without cluttering the active transaction pool, though recent updates have expanded its data limit significantly.

What it does:

Data Embedding: It attaches extra data (metadata, notes, links) directly to a Bitcoin transaction, storing it permanently on the blockchain.

Again, just google overview, but I shouldn't have to fact check everything you say.

That's not how you win me over, the knots people are a cult and the core people are compulsive liars.

I don't trust either side.