1. MongoDB：
MongoDB是一个跨平台的面向文档的非关系(即NoSQL)数据库程序。它是一个开放源代码文档数据库，以键值对的形式存储数据。 MongoDB由MongoDB Inc.开发，最初于2009年2月11日发布。它使用C++，Go，JavaScript， Python语言编写。 MongoDB提供高速，高可用性和高可伸缩性。
2. MariaDB：
MariaDB是一个开源关系数据库管理系统(RDBMS)，它是广泛使用的MySQL数据库技术的兼容即插即用替代品。它由MariaDB基金会开发，最初于2009年10月29日发布。MariaDB具有大量新功能，因此在性能和面向用户方面比MySQL更好。
MongoBD和MariaDB之间的区别：
| S.NO. | mongodb | mariadb |
|---|---|---|
| 1. | Developed by MongoDB Inc. and initially released on 11 February 2009. | Developed by MariaDB Corporation Ab. and initially released on 29 October 2009. |
| 2. | MongoDB is written in C++, Go, JavaScript, Python languages. | MariaDB is written in C, C++, Perl and Bash languages. |
| 3. | MongoDB provides Multi-document ACID transactions with snapshot isolation. | MariaDB only provides ACID transactions without snapshot isolation. |
| 4. | MongoDB has a large base for supporting all the languages in the system. | MariaDB does not support Matlab and shell languages. |
| 5. | MongoDB does not work like SQL but has access rights to users based on their roles in the system. | MariaDB has many queries similar and the working is also similar to SQL. |
| 6. | MongoDb does not provides the concept of Referential Integrity. Hence no Foreign Keys. | MariaDB provides the concept of Referential Integrity and have Foreign keys. |
| 7. | The replication method that MongoDB supports is Master-Slave Replication. | MariaDB supports both Master-Slave Replication and Master-Master Replication. |
| 8. | MongoDB supports Map Reduce method. | MariaDB does not supports Map Reduce method. |
| 9. | Server operating systems for MongoDB are Solaris, Linux, OS X, Windows. | Server operating systems for MariaDB are FreeBSD, Linux, Solaris, Windows |
| 10. | Famous companies like Adobe, Amadeus, Lyft, ViaVarejo, Craftbase, etc uses MongoDB. | Famous companies like CUNY, Accenture, Docplanner, Grooveshark, Northrop Grumman, uses MariaDB. |