ECommerce
In the context of eCommerce websites, the meaning of web-usability is narrowed down to efficiency: triggering sales and/or performing other transactions valuable to the business.
Web usability received renewed attention as many early e-commerce websites started failing in 2000. Whereas fancy graphical design had been regarded as indispensable for a successful e-business application during the emergence of internet in the 1990s, web-usability protagonists said quite the reverse was true. They advocated the KISS principle (keep it simple, stupid), which had proven to be effective in focusing end-user attention.
Read more about this topic: Web Usability