'Authorized Dapps' are Dapps (decentralized apps) you've given permission to interact with your Argent wallet. For these Dapps you're connecting via Wallet Connect or Starknet connect, standards for connecting mobile wallets to desktop Dapps.
When you authorize a Dapp you give it permission to access your wallet and withdraw an amount of assets up to a limit you've chosen.
For example, if you want to enter a Pool Together prize draw you'll need to authorize a certain amount of assets to be withdrawn. PoolTogether will appear in your list of Authorized Dapps.
You can revoke a Dapps authorization at any time by going to Security - Authorized Dapps and following the on screen instructions. You will need to pay the network fee for this action as it is on an-chain transaction.
We've designed our integration to be much safer than traditional wallet-Dapp interactions as with Argent you can specify exactly what level of tokens the Dapp can access.