Thanks. That's clear. Do I uninstall the CC 2017? I don't want to use the hard drive space if I don't have to, at least not the solid state space.
Oddly, Adobe decided to label the new release "CC" by itself, rather than "CC 2018" (i.e., not following the "CC 2017," "CC 2015" etc., of previous major versions).
This is the case even on the splash screens at application startup – previously the splash screens would say "2017 Release," etc.
Not sure why they did this, as the original (first) Creative Cloud release in 2013 was also called just "CC." And so with many possible versions and updates around, it adds to the confusion. (Even Bani above wasn't sure at first which release you were referring to.)
If you want the feature differences by application between CC 2017 vs. CC 2018, see this post:
What Are the Differences Between Adobe CC 2018 vs. Older Versions?
Note: The default behavior of the CC Desktop app is to uninstall the prior version(s) when you install the latest one... Of you can uninstall it yourself manually (using your operating system's command), if you no longer want it on your machine. For more details, see:
Update apps to the October 2017 release of Adobe Creative Cloud