What is an Executor in Airflow and what types are available?

The Executor defines how tasks are run. Airflow supports several executor types suited for different scale and infrastructure needs:

• SequentialExecutor — runs one task at a time; only for development/testing.
• LocalExecutor — runs tasks in parallel on the same machine using subprocesses.
• CeleryExecutor — distributes tasks across a pool of Celery workers; suitable for production scale-out.
• KubernetesExecutor — spins up a new Kubernetes pod per task; great for isolation and dynamic resource allocation.
• CeleryKubernetesExecutor — hybrid of Celery and Kubernetes executors.

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