What is a Crypto Wallet app?

Could you please elaborate on what a Crypto Wallet app is? I'm curious to understand the fundamental functionality and purpose of such an application. Specifically, I'd like to know how it differs from traditional banking apps and what types of cryptocurrencies it supports. Furthermore, is it secure to store my digital assets in a Crypto Wallet app? If so, what kind of security measures does it employ? I'm also interested in knowing if these apps offer any additional features or benefits beyond just storing cryptocurrencies. Thank you for your assistance in clarifying these points.