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In this video, we're going to start to discuss interfaces in TypeScript, so as usual, we'll get a

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plain definition, some examples and so on.

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As a quick aside here, we're going to spend a pretty good amount of time.

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And TypeScript, talking about interfaces, the interplay between interfaces and classes is how we're

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going to really get very strong code reuse when we are writing typescript code.

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So if you understand interfaces really well, it's going to help you design really excellent applications.

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As a matter of fact, the entire second half of this course where we're going to work on a lot of applications

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is really going to come down to understanding how we can get interfaces and classes to work together

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really, really nicely.

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So if you don't understand this first, take through interfaces, totally fine, because we're going

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to be discussing them quite a bit.

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All right.

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So with that in mind, let's take a look at a quick definition here.

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So when we have interfaces, we are going to write out some amount of code to define a new type inside

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of application.

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The goal, this new type is to describe the different property names and a different property types

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that that object has.

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So when we create an interface, we are creating a new type inside of application, just the same way

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that we have types like String or Boolean or no, we're creating another new type.

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It's a custom type that you and I are going to define.

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Now, understanding interfaces is a lot easier when you have some code in front of you.

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So let's do a quick pause right here, come back in the next video and start to write out some examples.