Using Spring Framework Web when Tomcat is already installed and running

I am studying Spring Framework (all features) preparing to start some microservices and web applications for the first time. I am puzzled by the injection of tomcat by spring. If I buy java hosting with tomcat already running or setup tomcat to be already configured and supposedly running on a server, is this going to cause a conflict because it is also included in Spring? Or are we talking two different things where what is included in Spring is a connector to tomcat instead of tomcat itself?