Celery
Celery is an open-source, distributed task queue system written in Python that enables asynchronous execution of tasks in the background. It allows developers to offload time-consuming or resource-intensive operations, such as sending emails, processing images, or handling API calls, from the main application flow to worker processes. It supports multiple message brokers like RabbitMQ, Redis, and Amazon SQS for task distribution and result storage.
Developers should use Celery when building applications that require handling long-running tasks, batch processing, or scheduled jobs without blocking user requests, such as in web applications, data pipelines, or microservices architectures. It is particularly useful for improving application responsiveness, scalability, and reliability by decoupling task execution from the main process, enabling parallel processing and fault tolerance.