1. Neo4j ：
它是最著名的图形数据库管理系统，也是 Neo4j, Inc. 开发的 NoSQL 数据库系统。它不同于 Mysql 或 MongoDB，因为它具有与其他数据库管理系统相比的特殊功能。 Neo4j 还以非表格格式或非 Jason 格式的图形形式存储和呈现数据。在这整个数据由节点表示，在那里你可以创建节点之间的关系，这意味着整个数据库集合看起来像一个图形，这使得 Neo4j 与其他数据库管理系统不同。
2. MongoDB：
它是面向文档的开源和非关系(即 NoSQL)数据库程序。它是一个跨平台的文档数据库，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。MongoDB 使用具有可选模式的类 JSON 文档。它是使用 C++、Go、JavaScript、 Python语言开发的。 MongoDB 提供高速、高可用性和高可扩展性。
它使用 C++、Erlang、C、Go 语言编写，其服务器旨在为我们提供易于扩展的键值或 JSON 文档访问，具有高持续吞吐量和低延迟。
Neo4j 和 MongoDB 的区别：
| S.No. | Neo4j | MongoDB |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by MongoDB Inc. |
| 2. | It was initially released in 2007. | It was initially released on 11 February 2009. |
| 3. | It is written using Java and Scala language. | It is written in C++, Go, JavaScript, Python languages. |
| 4. | It does not supports Map Reduce method. | It supports Map Reduce method. |
| 5. | It has foreign keys. | It does not have foreign keys. |
| 6. | Neo4j APIs and other access methods includes Bolt protocol, Cypher query language, Java API, Neo4j-OGM, RESTful HTTP, API, Spring Data Neo4j, TinkerPop 3. | APIs and other access methods include proprietary protocol using JSON. |
| 7. | It is data schema free and schema optional. | It is data schema free. |
| 8. | It does not support SQL. | It provides support to Read-only SQL queries via the MongoDB Connector for BI. |
| 9. | Its primary database model is is Graph DBMS. | Its primary database model is Document Store. |
| 10. | Neo4j supports programming languages which are .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. | It supports D, Dart, Delphi, Erlang, Go, Groovy, Lisp, Lua, MatLab, Perl, PHP, PowerShell, Prolog, Actionscript, C, C##, C++, Clojure, Python, R, Ruby, Haskell, Java, Javascript, Scala, Smalltalk programming languages. |
| 11. | It does not supports Partitioning methods. | It supports Sharding Partitioning methods. |
| 12. | Neo4j is uesd by famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc. | MongoDB is used by Famous companies like Amadeus, ViaVarejo, Craftbase, Lyft, etc. |