...It allows developers to wrap critical code sections with database-level locks to prevent race conditions across concurrent processes or threads. It’s especially useful in distributed systems, background job processing, or scheduled tasks where application-level mutexes aren't sufficient.
...Developers can enqueue explicit job objects or use send_later to delay method execution on existing objects. It is best suited for Rails and Ruby applications that need a simple, persistent background job system for emails, imports, downloads, indexing, and batch work.