Servers vs worker count on the dashboard? Why more than one worker?

What is the difference between what the dashboard displays as “Servers” and “Workers”.
In my core web app, Im using these options with the intention of ensuring only a single job is running at a time. I dont want a job starting on another thread if the same job has already started and not completed yet
app.UseHangfireServer(new BackgroundJobServerOptions { WorkerCount = 1 });

It means that there are two Hangfire servers running, one has 1 worker count and the other has 10 worker counts.

Only one instance of worker from one server will pick a job. Hangfire by default will prevent duplicate jobs running. You don’t have to do anything.