A dapp is actually a web application with the difference that it interacts with the smart contracts deployed in the blockchain and you will be signing these actions with your private keys (your wallet).

What is a Dapp? by Blockgeeks​

What are Dapps? by @Matt__Hussey and @ScottChipolina​

If you are using a Web 3.0 app you will always find a connect button for your wallet.

⭐️ Extra

Blockchains Are the New App Stores by @nickresendez​