The failed delivery of email communication due to an permanent reason like a non-existent address.
Heading tags (H1, H2, H3 etc) are standard elements used to define headings and subheadings on a web page. The number indicates the im- portance, so H1 tags are viewed by the spiders as being more important than the H3 tags. Using target key phrases in your H tags is essential for effective SEO.
A black hat technique where the keywords are invisible to the naked eye as they are the same colour as the page’s background. Search engines are not fooled by this unethical technique and sites will be penalised for employing it.
The first page of any website. The home page gives users a glimpse into what your site is about – very much like the index in a book, or a magazine.
A link in a document (electronic) that allows you, once you click on it, to follow the link to the relevant web page.