Explain OrientDBand its uses?

OrientDB is an open-source NoSQL database management system that is written in Java. It supports a Multi-model database, supporting graph, document, key/value, and object models. It offers several indexing mechanisms based on B-tree and Extendible hashing, the last one is known as "hash index". It implements LSM-tree and Fractal tree index based indexes.

Some uses of OrientDB are as follows:
1. It is used to store data and provide facilities (tools) to search for specific records in a given set of data.
2. It is used to store special information used to manage the data. This information is called metadata and it is not shown to all the people looking at the data.
3. IT is used to solve cases where many users want to access (and possibly change) the same entries of data.
4. It is used to manage access rights (who is allowed to see the data, who can change it)
5. It is used to track information about users, their name, login information, various addresses, and phone numbers.