Every WordPress website needs a theme to tell it how to display the site’s content. The theme contains templates to determine where all the different elements should go and a style sheet to control their appearance.
One of the great things about WordPress is that you can transform the way your website looks and works just by installing and activating a different theme. The same content can be displayed in a completely different way to give a very different look to your site.
To illustrate this, I set up a test site for a fictitious photographer and tried out several different themes. You can see screen prints of the results below.
Please note that I am not necessarily recommending these themes; it was just an exercise to show how easy it is to change a site’s appearance. In each case I have just used the default settings whereas if I was using one of these themes on a live website then I would spend more time personalising it.