Android’s popularity is mainly because of its customizability. Users can easily change or alter nearly any part of the mobile OS to suit their personal preferences. Moreover, thousands of free applications competing against each other to gain a larger user base have made the OS even more lucrative.
Unlike Windows Phone and Apple's iOS, most android applications are available free of charge on the app store. This presents the user with numerous options to carry out their tasks and often leads to installation of several apps that carry out same function.
The conflict between various apps to become your default option can lead to issues like app crashing and slowing down of your smartphone. It is better if you specify which apps gets precedence. Here is how you can get that sorted.