A "regular" tomcat (or any other servlet container) is installed on your file system, and you can see the "bin" folder, and the "webapps". But an Embedded tomcat works differently; it consists of a single Java web application along with a full Tomcat server distribution, packaged together and compressed into a single JAR, WAR or ZIP file.

You can still configure it, but it comes "inside" your JAR.

Read more:

https://medium.com/@youeleven/understamding-spring-boots-embedded-tomcat-container-8e1cc32bc689#:~:text=The%20embedded%20Tomcat%20container%20in%20Spring%20Boot%20revolutionizes%20the%20way,developers%20building%20modern%20web%20applications.

https://www.theserverside.com/definition/embedded-Tomcat