Are multiple servlets still used? [closed]

I was learning Spring Boot and found out that you can have multiple servlets in a single Spring Boot application. I was thinking about the use case of having multiple servlets, one that came to my mind was separation of concerns, like different servlets providing different functionalities.

So my questions are:

1. What are the use cases of using multiple servlets?
2. Considering my assumption about separation of concerns is correct and the rise of microservices, is there still any advantage of using multiple servlets?