Unlike relational databases, NoSQL databases such as MongoDB store data as collections of fields, rather than rows and columns. It mimics the way humans think of objects and provides a smooth interface for applications that are object-oriented. Each object is stored in JSON format in a data structure called a Document. The Document may represent a single word and its definition for example. A Document is stored in a Collection, which contains one to many Documents. The MongoDB database then contains one to many Collections. In this course, you will create a MongoDB database collection containing words and their definitions. You will then retrieve data from the collection, update data, remove document data from the collection, and finally delete a document, a collection, and a database.