How do we know that these people are supporters of a Brazilian soccer team? They have a sense of identity. What is it?

Similarly, text, graphics, and colours on a website give it a sense of identity.

The function of graphic design on your website is to:

• Give the site a uniform sense of identity, so that users know that they are still in your website as they read different pages.
• Break the monotony of text. Too much text quickly becomes boring.
• Provide a consistent, simple, and predictable layout for every page. This is often achieved with a combination of graphics and layout.