client based vs server based subscription models

EventStoreDB
1

I’ve struggled to interpret this properly from the docs, would somebody be able to clarify what this actually refers to in practice please?

2

There are two subscription models. In one model (catchup subscription)
the client maintains the state of where it is in the subscription. In
the other model (competing consumers/persistent subscription) the
server maintains the state of the subscription.

There are many differences between the two models.
http://docs.geteventstore.com/introduction/competing-consumers/
discusses may of them.

3

Ok understood, I thought it referred to something beyond this.