Is a NoSQL database. The command to invoke the MongoDB shell is 'mongosh'. List of common commands: - show dbs - Outputs available databases. - show collections - Output available collections. - use <database_name> - Used to choose a database to work with/in. - db.<collection_name>.find().pretty() - Used to output the contents of a collection in a readable format. Example: ``` user@vm$ mongosh <host>:<port> useracc> mongosh show dbs admin info other db example useracc> use admin switched to db admin admin> show collections important admin> db.important.find().pretty() contents found within 'important' collection. ```