Utilization is a fancy way of saying "use." A team's utilization of a gym for practices might need to continue until it stops raining.
You can see the verb utilize in utilization. When you utilize something, you use it, whether it is a tool, like when you utilize a pen to write something down, or a skill or talent, like the speed you utilize when you run a race. So utilization is the act of using, like the utilization of your voice that enables you to sing a song.