When design your web site, you should pay high attention on usability.

What is usability? It means different things to different web site designers. It’s also been at the top of every user’s requirements list since the Web became part of daily life. When users click through to your web site from a search results page, they want the site to work for them. That means they want to be able to find what they’re looking for, to navigate from place to place, and to be able to load pages quickly, without any difficulties.

Web-site users are impatient. They don’t like to wait for pages to load, they don’t want to deal with Flash graphics or JavaScript, and they don’t want to be lost. These are all elements of usability — how the user navigates through and uses your web site. And yes, usability has an impact on SEO. Especially from the perspective of your site links and loading times.

When a search engine crawler comes to your site, it crawls through the site, looking at keywords, links, contextual clues, meta and HTML tags, and a whole host of other elements. The crawler will move from page to page, indexing what it finds for inclusion in search results. But if that crawler reaches the first page and can’t get past the fancy Flash you’ve created, or if it gets into the site and
finds links that don’t work or that lead to unexpected locations, it will recognize this and make note
of it in the indexed site data. That can damage your search engine rankings.

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