Android is an open-source, customizable mobile operating system for use on touchscreen devices. It’s the most popular operating system in use today. While mainly installed on smartphones, it is also in use on other smart devices.
Blockchain is resistant to modification of the data. It is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. Although blockchain records are not unalterable.
Web development is a broad term for the work involved in developing a web site for the Internet or an intranet. Web development can range from developing a simple single static page of plain text to complex web-based internet applications.