“Source is the where, medium is the how.”
Why it matters
The sources screen shows you where your website visitors are coming from. The table combines the source, the medium, the website URL, the number of visitors and page views. Sources are websites, newsletters, search engines, email, etc.
How to use it
There’s a lot of information here. Take a look at the table, because the combination of source and medium provides a lot of insights into where your visitors are coming from. And remember, you can use query parameters to define your own sources and mediums.