First Interaction vs Last Interaction: Best Marketing Channels
When Google introduced Attribution Modelling in their analytics, marketers learned more about Last Interactions, First Interaction and Assisted Conversions (More on this in another tutorial). But let us look at the difference between first interaction and last interaction. The Marketing channel that introduced the visitor to your website just before the conversion is categorized under Last Interaction and the channel that first introduced the visitor to your website is the First Interaction channel.

With advanced segmentation, it has become easier to track visits from various campaign in Google Analytics. But marketers and agencies still use utm_source, utm_campaign and utm_medium to track click through of urls
If you are managing multiple blogs or websites or even a single website on which your income depends on, then it is essential that you invest in Analytics Software. Now you might ask "Why you need to invest when Google Analytics gives you all the features for free". Don't get me wrong, Google Analytics is great but use it only if you don't monitor traffic on a day to day or even on an hourly basis.