mik-laj commented on a change in pull request #13660:
URL: https://github.com/apache/airflow/pull/13660#discussion_r563270614
##########
File path: docs/apache-airflow/concepts.rst
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@@ -23,6 +23,38 @@ Concepts
The Airflow platform is a tool for describing, executing, and monitoring
workflows.
+.. _architecture:
+
+Basic Airflow architecture
+''''''''''''''''''''''''''
+
+Primarily intended for development use, the basic Airflow architecture with
the Local and Sequential executors is an
+excellent starting point for understanding the architecture of Apache Airflow.
+
+.. image:: img/arch-diag-basic.png
+
+
+There are a few components to note:
+
+* **Metadata Database**: Airflow uses a SQL database to store metadata about
the data pipelines being run. In the
+ diagram above, this is represented as Postgres which is extremely popular
with Airflow.
+ Alternate databases supported with Airflow include MySQL.
+
+* **Web Server** and **Scheduler**: The Airflow web server and Scheduler are
separate processes run (in this case)
+ on the local machine and interact with the database mentioned above.
+
+* The **Executor** is shown separately above, since it is commonly discussed
within Airflow and in the documentation, but
+ in reality it is NOT a separate process, but run within the Scheduler.
+
+* The **Worker(s)** are separate processes which also interact with the other
components of the Airflow architecture and
+ the metadata repository.
Review comment:
```suggestion
the metadata database.
```
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