diff --git a/chapters/03_secondary_practices.md b/chapters/03_secondary_practices.md
index 6af33ea..9c4349c 100644
--- a/chapters/03_secondary_practices.md
+++ b/chapters/03_secondary_practices.md
@@ -266,24 +266,65 @@ stable.
 #### Databases
 
 A **database** is a data set together with specialized software to help you
-organize, query, and update that data set. Databases are usually more
-computationally efficient than languages like R and Python. Most databases also
-support querying large data sets (hundreds of gigabytes) without any extra
-setup. Some databases support multiple users, which can be convenient for
-collaborative work (this is also one reason why databases are widely used for
-data storage in web applications).
+work with the data set. Databases can:
+
+
+* create a definitive version of your data that multiple people can access
+without creating conflicts.
+
+* provide quality control measures to make sure typos don't get introduced into
+your data.
+
+* query millions of observations in seconds (unlike Excel or Google Sheets).
+
+* store data more efficiently than regular files
+
+* control who has access to your data, and what they can do with it, on a very
+granular level.
+
+Databases are a specialized tool. They are optimized for querying and
+transforming data. As such, they are generally faster at those tasks than R or
+Python. However, they don't do everything. You can't create a data visualization
+using a database, or run a statistical analysis. A database is a perfect data
+source for those tasks to ensure that your results are reproducible across
+collaborators and over time. Databases also make an excellent platform for
+sharing or publishing your data. Their permissions functionality means you can
+easily give the public read only access to your finalized data products, while
+keeping the raw or unprocessed data only accessible to your collaborators.
+
+Historically, databases were restricted to primarily tabular data (rows and
+columns), in what are called relational databases. In recent years though, new
+types of databases have come on the scene that can efficiently store all sorts
+of different data, including nested or tree based data, graph data, and
+unstructured text. The type of data you have will inform what kind of
+database would be best for you, which you can find out more about in the
+[Overview of Databases and Data Storage reader][datalab-db]
+
+Many, if not most, database systems have graphical user interface software to
+make it easier to interace with the database. But, to get the most out of a
+database, it is helpful to the query langauge associated with your database of
+choice. For relational databases this is SQL. To get get started with SQL, see
+[Introduction to SQL for Querying Databases workshop reader][datalab-sql].
+Non-relational (SQL-based) databases use a variety of langauges to write
+queries. MongoDB, a document based database, uses MQL, which you can learn in
+W3School's [MongoDB Tutorial][mongo]. Like other computer languages, query
+languages like SQL and MQL make your data cleaning and transformation processes
+reproducible. However, they are much easier to learn because the set of tasks
+they are designed to do is much smaller. 
 
 
 :::{seealso}
-See DataLab's [An Overview of Databases and Data Storage workshop
-reader][datalab-db] for an introduction to the topic. Then see DataLab's
-[Introduction to SQL for Querying Databases workshop reader][datalab-sql] to
-learn how to query data in databases.
+DataLab's [An Overview of Databases and Data Storage workshop
+reader][datalab-db] provides an introduction to databases. DataLab's
+[Introduction to SQL for Querying Databases workshop reader][datalab-sql]
+teaches you how to query data in relational databases. W3School's [MongoDB
+tutorial][mongo] shows you how to query data in a document or text based
+database using MQL.
 :::
 
 [datalab-db]: https://ucdavisdatalab.github.io/workshop_intro_to_databases/
 [datalab-sql]: https://ucdavisdatalab.github.io/workshop_intro_to_sql/
-
+[mongo]: https://www.w3schools.com/mongodb/index.php
 
 
 Workflow Automation