What does 'pan' mean?

Both of those are pans to me.
A "pot" has high vertical sides. 2 is sort of a cross between a pot and a pan, but (again, for me) still more "pan" than "pot."

Not all pans have lids. Most pots have lids.

If you want a separate name for the first one, you can call it a skillet.

CJ

Thank you.

I have one more question. I've found in online dictionary such sentence:

"Replace the saucepan lid and simmer for 10 minutes."

Does it mean I have to simmer something without the lid (or with the lid)?

Put the lid back on the saucepan and let it cook over lower heat so it's just bubbling a little bit, with the lid on.

AnonymousReplace the saucepan lid

The lid must have been off at this point in the process. You have to put it back on.

AnonymousDoes it mean I have to simmer something without the lid (or with the lid)?

With the lid, because you just put the lid on the saucepan.

CJ

I understand. Thank you.

In British English, #1 is a frying pan.

Rover_KEIn British English, #1 is a frying pan.

Also another way of saying it in AmE.

CJ