How Spring Boot Application Works Internally?

Ever wonder what happens when we select 'Rua As' -> 'Spring Boot App'?
I always thought 'Wow!', SptingBoot is so simple. So what happens internally when we run a Spring Boot App from our IDE?

I found couple of interesting posts and it helped me understand the flow.
So thought of sharing for the people who are ingterested.

https://medium.com/@kkgsanjeewac77/curious-engineering-facts-spring-boot-internal-keycloak-january-release-27-25-c91a9ebba29f

https://www.php.cn/faq/537379.html

Hope its interesting for curious minds like me :)