Other wise this will affects your website negatively.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.
The links on the other websites are called external link.
You should not have too much external links on your website.
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.
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. Webmasters, publicists and ad networks assess your website that base on alexa rank estimation of your site or online journal.
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