Source

The origin of your traffic, such as(Article Submission)
It is a process of submitting an article related to your website. More a search engine or website. MediumThe category of a web traffic source, for example, organic search (Organic), cost-per-click paid sea... More: the general category of the source, for example, organic search (organic), cost-per-click paid search (cpc(Cost Per Click)
The amount of money spent to get an ad clicked when running PPC campaigns. More), web referralThe website a user visited prior to visiting another website. Typically the user clicked on a link t... More (referralThe website a user visited prior to visiting another website. Typically the user clicked on a link t... More).