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Now in the previous course section,

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we had a look at some advanced JavaScript concepts.

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But before that, we wrote a lot of backend JavaScript code.

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We had a look at some advanced concepts there as well,

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and we learned how we can use Express with Node.js

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to handle incoming requests, how we can set up routes,

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how we can send back responses.

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And what we also did there is we stored data on the disc,

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so in a file on our file system,

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and we read data from our file system to send it back.

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But whilst the approach we took there worked,

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it's not optimal.

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And in this course section,

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I will explain why the approach taken there is not optimal

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and what we can do better,

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because in this course section,

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we're going to dive back into more backend technology

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and we're going to move onwards to databases.

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And for that, we'll learn what exactly databases are

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and why we need them, which problem they solve,

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and why we need them in almost any website

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and web application we're building.

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And we will then explore which kinds of databases we have.

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We will learn that there are SQL and NoSQL databases,

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and we will, of course, learn what that means for us,

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and which one is better.