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Sometimes you need a bit more power for retrieving your data.

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Now we're already extensively use the find and findOne methods and these are your default methods for

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retrieving data indeed

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but sometimes you want to do more complex transformations to your data.

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Now of course we talked about the fact that you want to store the data in your database in the format

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you need it in in your application

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but this is not always possible.

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You might have an online shop where the sellers can also generate detailed reports on their sales data,

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now it will probably be hard to store the data in exactly that format because these reports might be

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customizable by the sellers or let's say you have a customer facing application on which your data scientists

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in your company also work, of course you will gear your data towards your customers and you will

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store it in a way that allows your customers to quickly interact with your application and your data scientists

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might not be that important for you from a data modeling perspective

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therefore, hence you also need more complex data transformation capabilities.

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And in this module, we will have a look at the aggregation framework which gives you just that. You'll

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learn what exactly the aggregation framework is in mongodb and how you can use it to retrieve data

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in exactly the format you need it in your application.