Stands for User Experience: The overall experience a person has when visiting your website. You hope it’s good. Because this brings people back to your site — it also helps Google index it better.
What constitutes a good User Experience?
Make it as easy as possible for website visitors to get what they want. This means the fewest clicks to get where they want to be. So if you’re selling a product online there should be one click to get to the store where the product is for sale.
Intuitive navigation… the Menu Bar or Tabs at the top or down the side of your site should clearly say what the user sees when s/he clicks. There should be no thinking required. 🙂