Deploying a mint page allows you to create rules for the sale of tokens that haven't been created yet. The tokens aren't created on chain until your collectors pay to mint a token from this page. A tool that utilizes this functionality is our Claim App.
A common question we get is - Can a claim page can be used for pre-minted tokens?
This isn't possible as the claim page is used to sell/distribute tokens that haven't been minted yet. If you're looking to do this, please check out our Gallery tool.