What is the user-seed.conf file?

I'm a bit confused about the user-seed.conf. Based on the documentation provided by Splunk, it seems this is to set up the initial password. Does this apply to Splunk universal forwarders? I am using the Splunk Enterprise version, and when I got to log into the web portion, I do change the default admin password. Do I still need to create a user-seed.conf file and then drop different credentials in there? Splunk doesn't really provide a good context for what this is used for in my opinion. Here is the documentation I looked at: https://docs.splunk.com/Documentation/Splunk/6.5.0/Admin/User-seedconf Thanks in advance!