The Coinbase app, available on Android and IOS devices, is a Coinbase product for users who want to buy and sell cryptocurrencies. Again, it is effortless, secure, and regulated. You also need to know that you can store your cryptos, so you don't have to manage your private keys.
On the other hand, the Coinbase Wallet app is a standalone app that allows users to store their digital assets and explore the decentralized web with a Dapp browser/key vault. You don't need a Coinbase account to use the Coinbase Wallet app. The wallet allows users to manage their private keys and store their crypto assets directly on their devices.