I've watched some videos about Bubble.io that you can create mobile applications without code, in addition to building and linking the database of the system and doing the work/process flow of the App. Can this platform provide us with the functionality and build both the frontend and backend to release a native mobile app
Yes, you can create web apps with Bubble.io and wrap them into native Android / iOS apps with the converter Natively. It allows enabling a lot of native features like push notifications, biometrics authorization, geolocation, universal links etc.