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Now that you learned a lot about general queries and how to store data and how to retrieve data, it's

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time to also learn how to retrieve data efficiently.

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Now we'll have a look at indexes in this module and indexes are a feature that can drastically speed

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up your queries, though if used incorrectly,

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they can also slow down some of your operations.

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Now we'll take a look at all of that and the different kinds of queries in this module,

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I just want to highlight that in general, you as a developer will most likely not create that many

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indexes but if you're working as a single person on a web project for example and therefore are the

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single person using some mongodb solution,

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you still will need to know how to create indexes and even if you never create them, it's still worth

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understanding how indexes and queries work together.

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In this module, we'll have a look at what exactly an index is and how it can help us,

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we'll then have a look at the different types of indexes mongodb supports and we'll have a look

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at how you use indexes and how you can optimize your queries for indexes or the other way around, how you

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can optimize your indexes to support your queries.

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So with that, let's dive in and let's learn how indexes can help us.