Standard licenses are “computer locked” - meaning they’re associated with a specific PC, and the software can be told to authorize any user on that PC who logs in.
Floating licenses are not attached to a particular machine - you have a set maximum number of allowed users (based on how many seats you purchase) and you can install the software on as many computers as you like, but only (x) number of users can run it at any given time, where (x) is your seat count. If your PC’s are re-imaged somewhat often this is easier to manage, though it requires access to our license server through whatever firewall or network restrictions you might have.
Floating licenses have a minimum of 10 seats. If you had 30 computers, but only 15 users would ever be running the software at a given time, you’d purchase a 15 seat floating license (maybe add a couple, just to give you a little wiggle room).
Does that all make sense?