Software development is a process by which standalone or individual software is created using a specific programming language. It involves writing a series of interrelated programming code, which provides the functionality of the developed software. Software development may also be called application development and software design.
A web application is a computer program that utilizes web browsers and web technology to perform tasks over the Internet.
Android App is a software designed to run on an Android device and perform task over the internat or without internet.
ios App is a software designed to run on an ios device like iPhone, iPads and perform task over the internat or without internet.