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In this video.

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Let's get started with MongoDB terminologies because we are going to hear this one a lot.

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And to better understand MongoDB, we need to understand these common terms.

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And the first one is what we call database.

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In MongoDB, a database simply means a container for storing collections.

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So what is collection?

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And we have talked about what database before.

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So a way of storing collection in MongoDB is what we call database.

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So what is collection?

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Well, a collection is a group of documents.

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So a group of documents is what you call collection still is not clear.

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So what is documents?

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Great documents is a data that is in MongoDB collection.

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So again, this seems not to be clear.

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So this means that for collections we have for this call document and then for database, we have for

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this call collections.

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And the next term is what you call files.

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So what are those files?

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Are the individual pieces of data within a document where I believe this definition is not clear to

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you.

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That's why I'm going to show you this diagram.

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So what is a database?

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So let's take it that we are developing e commerce application.

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And for e commerce application we have different types of data.

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For example, product customers, orders, payments, transactions.

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So all of these are data and is being stored inside one container called database.

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So this container is what we call database.

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And inside the database we have what is called collections, as we discussed in a previous video.

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So what are collections?

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So collections are pieces of data that are related in your application and we can save it in one collection.

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So for E commerce application, we have users, meaning we are going to store customers or users inside

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this collection.

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And for the same application we can also have product collections.

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So if we see that a database contains what collections and we can have many collections inside one database

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and inside the collection we have what is called the actual uses.

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You can see that in MongoDB data are being stored in a JSON format.

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So in the collection of users we can have many uses.

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In this case, let's say we have two users, Emma and John, with property and value.

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And for product collection we can have individual products.

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The first one is iMac and the next one is Laptop and this one is what we call document.

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So documents are pieces of data inside collection.

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So when we say failures, the properties and value here are what we call the fields.

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So you can see in a nutshell what is database collection and document.

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So be familiar with this syntax.

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So the next video we will talk about ways of using MongoDB or how we can use MongoDB in the next video.