What is "Not Set" in Google Analytics?

[makoo]

What is "Not Set" in Google Analytics?

[jayam]

(not set) is a placeholder name that Analytics uses when it hasn't received any information for the dimension you have selected. The reasons for (not set) appearing as a dimension value vary according to the report.

[Dynapro]

“not set” in Google Analytics tells us that Google Analytics didn’t receive any information for the item you selected. It’s usuallyassociated with any direct/referral visit, so it does not have campaign information like as keyword, match type, etc. associated with the visit.

[jayammrg]

Go to your Google Analytics standard reports.
Select the “Admin” button on the top right.
Click “Profile Settings”
Look down to “Ecommerce Settings” and select “Yes, and Ecommerce Site” from the drop-down menu.
Click “Apply” at the bottom of the page.

[chandrao7]

(Not Set) = A direct visit or a referral from another site

This is a little more complicated, but basically refers to a catch-all for information Google Analytics wasn't able to identify. For example, if you see landing page = (not set), it probably means that session didn't have a page or screen view

[shimarhussain12]

(not set) is a placeholder name that Analytics uses when it hasn't received any information for the dimension you have selected. The reasons for (not set) appearing as a dimension value vary according to the report. In this article: Advertising reports.