MongoDB use DATABASE_NAME is used to create database. The command will create a new database if it doesn't exist, otherwise it will return the existing database.
Syntax
Basic syntax of use DATABASE statement is:
use DATABASE_NAME
Example
If you want to create a database with name mydb, then use DATABASE statement would be:
> use mydb
switched to db mydb
To check your currently selected database, use the command db
> db
mydb
If you want to check your databases list, use the command show dbs.
> show dbs