Regarding this screenshot below.
I've inserted some red arrows - I assume this is the "unique visitors" (as we called it in the old times?)
But what about sessions and the returning visiots?
What does the 1.018.988 returning visitors mean? Is this people who returned after they've been away for a while from the website? (I have a lot of products in my webshop, so could it also be different products visited again?)