Mobile applications need to be downloaded from an app store such as the Google Play store or the App Store for Apple devices, as opposed to websites, which can be viewed by typing the URL in your browser.
Mobile apps usually have better user experience and therefore can yield better results regarding conversion rates and user interaction.
Mobile application development tends to cost more than website development as it will usually require more time to develop. There are a number of different approaches to mobile app development, most of which can be categorised into two types, hybrid and native.
Hybrid apps are developed using web technologies and wrapped in a native container which means you can create a mobile app that works on multiple devices. Alternatively, a native application will need to be developed specifically for an operating system, for example, Apple or Android.
Native applications are typically faster and more efficient than hybrid applications because they're written in the language designed for the operating system.