Pls, am new to programming, just want to know what language can be used to create andriod, IOS and desktop applications.

Answer 1

adding to Vlad Serbu s answer:
using xamarin you can create cross platform applications with c# and you can create mobile apps using javascript and react native

Answer 2

Android: Java/Kotlin
iOS: Objective-C/Swift
Desktop: C/C++/C#/VB.NET/Java/Python etc.

Answer 3

Xcode for ios and for android id use java,c++ and obejective C