What is the difference between dependency injection by reference or by value?

Question

Java

The question is about the Spring Framework. You can inject dependencies, for example, into some service, by ref="" , or you can by value="". In what cases should one or the other method be used?
Correct me if I misunderstood something.

Answer 1

value - for primitives, strings, ${properties} and #{Spring Expression Language}.
ref - if you need to inject the bean. The ref specifies the bean id