If you've been looking into this whole 'building a website' thing, you've probably heard the terms "Search Engine Marketing", "Search Engine Optimization (SEO)" more than a few times. And you've probably figured out by now that these terms refer to the process of making your website as attractive as possible to search engines like Google, Yahoo, etc so that your website will appear higher in their listing when your prospective customers do a search on certain keywords that relate to your business.
The beauty (and bottomless nature) of search engine optimization is that you can optimize every single page for a different set of keywords if you want to. If you sell home appliances, and you have one page for 'Vacuum Cleaners' and another for Dishwashwers, the idea is to attract people who are looking for "home appliances" AND people who are looking for vacuum cleaners AND people who are looking for dishwashers.