What is the difference between Spring Boot and Spring Cloud?

Spring Boot is about building a SINGLE, standalone, production-ready application quickly — auto-configuration, embedded servers, and starters that remove boilerplate for one service. Spring Cloud is built ON TOP of Spring Boot and addresses concerns that only exist once you have MULTIPLE services talking to each other — service discovery (Eureka), API gateways, distributed config, circuit breakers, and client-side load balancing.