In mongoDB we can remove a document like in SQL. In mongoDb we use remove function to remove a document.
In remove function we specify some criteria that is like where clause in SQL
if we want to remove a document where name is mike the we will do it like this.
If we donot specify any condition then all the documents in collection will be removed one by one.
If we have a large collection and we want to remove more efficiently then
This command will drop whole collection.