RQ, also known as Redis Queue, is a Python library that allows developers to enqueue jobs to be processed in the background with workers. The RQ workers will be called when it's time to execute the queue in the background. Using this task queue, tasks can be processed in the background with little to no hassle. A Redis installation is required for RQ to function, and a virtual environment should be created before installing the rq package. The tutorial covers setting up a project directory, creating a virtual environment, installing the rq package, and running the Redis server. It also explains how to build tasks, create a queue, run the queue, handle exceptions, and force failed tasks to retry. RQ supports developers in handling exceptions in their own way by injecting their own logic into the rq workers.