1. It is a unique string of numbers separated by periods that identifies each computer using the Internet Protocol to communicate over a network. To keep all of these machines straight, each machine on the Internet is assigned a unique address called an IP address
2. Domain name is the most recognized system for assigning addresses to Internet web servers and it's the part of a network address that identifies it as belonging to a particular domain.
3. It's a standardized system for tagging text files to achieve font, color, graphic, and hyperlink effects on World Wide Web pages.
4. index.html
5.The img tag defines an image in an HTML page. The img tag has two required attributes: src and alt.