When you are deciding how to allocate your online dollars you will want to have a solid understand of how your campaigns have performed in the past. A great way to get a quick high level handle on this is with the All Traffic Sources Report.
So let's start with a couple of definitions. What do Source and Medium mean?
Source is the referring site, that is, the domain of the site that a visitor has clicked on; a link that has taken them over to your site. Some common referral sources are search engines (both paid and organic), a link from an affiliate's site, a blog or article, an email, a partner or any other site that has a link to you. It could even be a document with an embedded link to your site.
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