The process of optimizing your pages to give them high-ranking placement in the search results page of a search engine (SERP) - including Google, Bing, Yahoo and other search engines.

The visible graphical interface features of an application are sometimes referred to as chrome. See Applying custom module chrome for information about how to modify the look of modules (in other words, the module "chrome").

Reference: http://docs.joomla.org/Glossary