Medium is one of the four main dimensions (along with sourceSource is one of the four main dimensions (along with medium, campaign and channel) for reporting and analyzing how people found your website. Source tells you where the message was seen. For example, a source of ‘google’ would indicate that someone found your website after performing a search on Google. Source can be used in combination with medium for more granular insights, for example, a source of ‘google’ and a medium of ‘cpc’ would be reported for paid clicks from your AdWords campaigns.... Always-R Glossary, campaignThe top-level structure of your account, think of campaigns as folders within your account. You can create one or more campaigns inside your account based on your advertising objectives. There are multiple ways to structure your campaigns, for example, you can use campaigns for different targeting (search vs. display), for structuring keywords, allocating budget and more. Each campaign contains one or more ad groups to create a more granular structure inside your account. See also ad group.... Always-R Glossary and channelChannels provide top-level groupings of your inbound marketing. Each channel combines source and medium so you can understand overall performance. For example, the default channel grouping includes ‘Organic Search’, ‘Paid Search’, ‘Social’ and ‘Email’ which automatically combines pre-defined sources and mediums. You can also configure your own custom channel groupings.... Always-R Glossary) for reporting and analyzing how people found your website. Medium tells you how the message was communicated. For example, ‘organic’ for free search traffic, ‘cpc’ for cost-per-click and ‘referral’ for inbound links from other websites.