JAVA
Java, the #1 programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It allows application developers “write once, run anywhere”. Java software reduces costs, drives innovation, and improves application services.

.NET
.NET Framework is a software framework developed by Microsoft that runs primarily on Windows Server. Programs written for .NET Framework execute in a software environment known as Common Language Runtime (CLR), an application virtual machine that provides services such as security, memory management, and exception handling..NET Framework is intended to be used by most new applications created for the Windows platform.

ANDROID
Android is a mobile operating system (OS) developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. It has been the best-selling OS on tablets and on smartphones since 2013.

IOS
IOS is a mobile operating system created and developed by Apple Inc and distributed exclusively for Apple hardware. It is the operating system that presently powers many of the company’s mobile devices, including the iPhone, iPad, and iPod touch. It is the second most popular mobile operating system in the world by sales, after Android.