Google Analytic drops few cookies that help them produce the nice reports that you in Google Analytics. One of those cookies is _umtz. This cookie is used to determine the sources visitor used to visit your site Below is an explanation of this cookie.
_utmz cookie consists of 5 parts separated by “.”
- A hash key that identifies the domain and is unique for each domain
- Timestamp of the visit via that source
- Total visits by the visitor
- Total number of sources the visitor has come from over the life of the cookie
- Details about the source (campaign, source, medium, content, keyword)
The final cookie looks like this
[domain identifier].[unique visitor id].[timstamp when cookie is set].[number of visits].[number of sources visitor has used to visit the site].[details about the source]
Details about the source: All the variables that you can set in a campaign are set in this part of the cookie (see the image below, I will write more about campaigns in a future post)
Note: Cookie is set every time a visitor uses a new source to If a cookie is already set with value then direct visit won’t overwrite it.