It's very important to use pictures on your website to bring up the main concepts of your website. Search engines understand the pictures by their alt tags.If there is no alt tag, search engine doesn't understand anything from the image.Domain is either you or your company's ID in the Internet, when you apply to connect to Internet, they will give you protocol number. Every device connected to Internet has an IP number. Each computer has to have an IP number to connect with other computers. ASCII defined 127 different alphanumeric characters that could be used on the internet: numbers (0-9), English letters (A-Z), and some special characters like ! ANSI (Windows-1252) was the original Windows character set, with support for 256 different character codes.
It's crucial to use alt tag and to make sure search engines know what you are talking about. Alexa rank is a scoring framework that measuring an activity and making characterization as per this movement those Alexa Toolbar clients are going to sites.Information : Page Speed is the speed at which your site responds to commands input.It is more important and beneficial for your site to have this at a lower value.You should not have too much external links on your website.Other wise this will affects your website negatively.