Load balancing via Eureka, ribbon?

Question

1. Does Eureka provide load balancing out of the box, is there a need for another dependency?
2. Why Ribbon instead of Eureka?
3. Why use load balancing via an API gateway?
4. spring-cloud-starter-loadbalancer, why is this required?
5. Client side balancing or server side load balancing, why use one over the other?

Answer 1

1. No it does not, Eureka is a service registry and service discovery tool
2. "With", not "instead of": Eureka holds the list of services, Ribbon downloads them and does load balancing on the client side
3. I'm not 100% sure I understand this, does this article help: https://www.linkedin.com/pulse/microservices-client-side-load-balancing-amit-kumar-sharma
4. Not required but if you want client side loadbalancing, it is a simple starting point, see the guide: https://spring.io/guides/gs/spring-cloud-loadbalancer/
5. See answer #3