Mobile apps and mobile sites are two separate aspects of a single program. While both are normally used on the same medium (tablets and smartphones), mobile apps are usually more interactive and customized compared to mobile sites (web sites).
Mobile apps are software applications developed by third-party developers. These applications are usually open source and designed to function on various platforms. Although they can run on most mobile devices, most mobile apps were designed with compatibility in mind; meaning they should be able to run smoothly on a wide variety of devices from phones to tablets and notebooks to desktops.
Since apps are designed to run on different devices, their compatibility cannot be guaranteed across all device brands, models and versions. The main problem with apps developed for multiple devices is that many of them do not work well on other devices. For instance, if an app is developed for a smartphone, it will most likely not work well for a tablet or smartwatch. It can also be difficult to use an app that works well on one device but fails on another.

One of the biggest advantages of mobile apps is that they can make a web site more functional. With apps, web sites will be able to provide users with content, features and functions that they would have not been able to achieve otherwise, since most apps offer functionality similar to those found in websites. It is even possible to develop apps that allow users to share web content on social networks or in other social networking sites.
The downside to using a mobile app is the fact that it is hard to use. Some users have trouble understanding how to navigate through and use applications. Some users prefer to avoid certain functions, which can affect their ability to find what they want. Since most mobile apps are designed for tablets and smartphones, users may not be able to browse the Internet on their tablet or smartphone without the use of an app. {since they often need to use a keyboard to do so. This is why apps are generally meant for a tablet or smartphone and not every screen size or type.
Mobile apps also require a good web development and design team. It is important that these teams create a complete mobile app with all functions and capabilities that the user can access and use. {including navigation, data transfer, data storage and sharing capabilities. {depending on which functions are needed and if users are going to interact with the app in some way. {such as reviews, ratings and comments and tips for other users to view. {if there is a store where users can buy products or services available). {or create links from the app to go to the website. {the main website. This will ensure that users get what they want out of the app.