Is a sequence of tasks, in airflow is defined as DAG.
Directed Acyclic Graph.
DAG is a collection of all the tasks you want to run, organized in a way that reflects their relationships and dependencies.
A task defines an unit of work within a DAG.
It is represented as a node in the DAG graph and it is written in python.
The task implements an operator.
The goal of the task is to achieve a specific thing, the method it uses is called operator.