Cross-platform mobile development refers to the development of mobile apps that can be used on multiple mobile platforms.
In the business world, a growing trend called BYOD (Bring Your Own Device) is rising. BYOD refers to employees bringing their own personal mobile device into the workplace to be used in place of traditional desktop computers or company-provided mobile devices for accessing company applications and data. Because of BYOD, it has become necessary for businesses to develop their corporate mobile apps and be able to send them to many different mobile devices that operate on various networks and use different operating systems.
Following technologies are used for developing cross platform apps.
phonegap
titanium
sencha touch
xamarin etc...