10gen started to develop a cloud computing stack in 2007 and soon realized that the most important innovation was centered around the document-oriented database that they built to power it, which was MongoDB. MongoDB was initially released on August 27, 2009.

Version 1 of MongoDB was pretty basic in terms of features, authorization, and ACID guarantees but it made up for these shortcomings with performance and flexibility.

In the following sections, we will highlight the major features of MongoDB, along with the version numbers with which they were introduced.