What is BitPay & Crypto Wallet app?

Could you please elaborate on what BitPay and Crypto Wallet app are? I'm interested in understanding their functionality, features, and how they fit into the larger cryptocurrency ecosystem. Also, how secure are these apps when it comes to storing and managing digital assets? Are there any specific benefits or advantages of using them? Additionally, are they user-friendly and suitable for beginners in the field of cryptocurrency? I would appreciate a detailed explanation to help me make an informed decision.