Search Engine Optimisation Glossary - Term I

Indexing - After a search engine has crawled the web, it ranks the URLs found using various criteria (see algorithm) and places them in the database, or index.

IP Address - A unique numerical Internet Protocol Address (IP Address) that is assigned to every computer that connects to the internet. IP addresses can be either static (never unchanging) or dynamic (changes with every internet connection).

Image map - An image that has different clickable areas linked to different pages. Image maps can either be imbedded in the HTML code or called as an external file. Search engines usually have difficulty spidering image maps when they are included from external files.

Impression - One display of an image or advertisement.

Inbound link - When site A links to site B, site A has an outbound link and site B has an inbound link . Inbound links are counted to determine link popularity , an important factor in SEO .
Invisible text - Text on a web page that is exactly or almost the same color as the background. The use of invisible text to load a page with keywords was once a popular SEO technique, but search engines can now detect invisible text and penalize sites that use it. Although there are examples of sites that use invisible text and "get away with it" on Google , the general consensus is that it is not worth the risk. The same results can usually be achieved by working the keywords into the visible body text.

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