Direct – This is traffic that has come to your site by either typing in your URL in their address bar or clicking a bookmark.
Referrals – This is traffic that has come from another site to your site. This is generally referred to as backlinks.
Search – This is traffic from search engines. This can further be divided into organic and paid traffic from the search engines.
Other – This data could be from social media links, email marketing links or direct marketing.
**Cookies – A piece of code that sits on user browser using which analytics determines whether he is visiting your website for the first time or multiple times.