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It's now finally time that we start storing our data in a more correct or realistic way because thus

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far, we either used the memory when we just stored the data in a variable in our node program and it

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was then even shared across requests or we stored it in a file and that's also not optimal because accessing

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files is pretty slow, especially as we start storing more and more data in them and it's therefore not really something

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we would do in a real application.

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Instead there, you typically would use a database which is a specific program that allows you or that is

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built for storing data and for efficiently retrieving data too. Therefore in this module, we'll have a look

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at the different kinds of databases or two important different kinds of databases, SQL and NoSQL

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databases and I will compare them, highlight the differences and we will actually see examples for both

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in the course and we'll start with SQL also in this module,

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so NoSQL will also follow in a separate module but let me first of all show you how you would use

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a SQL based database together with your nodejs application.

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This is what we'll cover and that will actually be a lot,

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so let's dive right into it and let's learn what the different kinds of databases are and whether a

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SQL or NoSQL could be the right choice for your application.