WordPress is an online, open source website creation tool written in PHP. But in non-geek speak, it's probably the easiest and most powerful blogging and website content management system (or CMS) in existence today.
Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. ... Android has been the best selling OS on tablets since 2013, and on smartphones it is dominant by any metric.
IOS is Apple's proprietary mobile operating system (OS) for its handheld devices, such as the iPhone, iPad and iPod Touch. ... Designed for use with Apple's multi-touch devices, iOS supports input through direct manipulation.