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[MUSIC]

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As we've been going along learning Ruby,
we've been working with various types.

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Numbers, strings, arrays, and hashes.

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We haven't gotten too far along into what
they actually are under the hood though.

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Although we've been calling these types,
Ruby calls these things classes.

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The types that we've been using so far are
all built into Ruby and

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come along with it when you download or
install Ruby as part of Ruby's core API.

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We're not limited to working only with the
built in classes that

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Ruby provides for us.

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We can also create our own.

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Why would we wanna do this?

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Well, I'm so glad you asked.

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As we're going along creating a program,

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it can be cumbersome to remember each
small nuanced part of

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what we're working with and remember those
parts in terms that computers understand.

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We start to abstract that away using
representations of

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things we're used to in the real world.

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These representations are called classes.

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You can think of a class as a blueprint.

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The blueprint tells Ruby how a class
should be structured and

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what it should do.

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For example, a blueprint of a car would
show how a car can be made.

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What it doesn't do is get into the
specific details about an individual car,

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like the color.