MongoDB stands for Mongo Database, and is a popular platform-independent document-oriented database application, which is often used as an alternative to MySQL. If you compare MongoDB with MySQL, you could say that MongoDB is more flexible as regards how the data is structured. In this regard, the information is grouped instead of being divided into related tables with fixed rows and columns, as is the case with MySQL.
MongoDB is available both as open source and in a paid version, and can be run either on-prem or as a cloud-based function service.
At Cegal, we have worked with MongoDB in many projects, and we are very good at MongoDB as regards implementation and the configuration of load balancing, replication and indexing.