What happens when you AirDrop a random person?

I'm curious to know, what exactly occurs when you use AirDrop to send something to a random individual? Is it a secure process? Are there any privacy concerns that should be addressed? Also, does the recipient have to accept the AirDrop for it to be successful? And if so, are they able to see the sender's information or identity? I'm interested in understanding the full process and any potential risks involved in this type of file sharing. Could you please elaborate on these points?