I'd like to ask if someone can help explain this definition found on https://en.bitcoin.it/wiki/Target
"The SHA-256 hash of a block's header must be lower than or equal to the current target for the block to be accepted by the network". I understand that target means difficulty. But I don't understand what the hash being lower than the target actually means.
I looked on youtube for explanations of target hash but they returned an investopedia definition.
Thank you in advance.