Normally, when you are browsing, the site can see your IP address and trace back to you. However, in the incognito mode, your personal details are protected. This allows you to browse without letting pages know that it is you who is browsing. It helps when you are trying to shield your identity from the site.
Moreover, your computer doesn’t keep record of the sites you visit either. Therefore, you don’t have to worry about clearing your history or protecting your personal information. It works for public computers as well so that you can easily access sites without being bothered to clear up after yourself.