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+And that's exactly what we're going to look at next,
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+relationships in the class diagram, how they're represented and
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+what they mean. First of all relationships as the
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+00:00:08,010 --> 00:00:12,550
+name says, describe interactions between classes or between objects in
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+my system. And we will describe three main types
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+of relationships. The first one is called a Dependency
+
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+relationship. And we can express that as X uses
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+Y and we represent it with a dashed directed line.
+
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+So when we have such a line between two classes
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+that means that the first class uses the second one. And
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+we're going to provide an example of a dependency in a
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+minute. The second type of relationship is an association that can
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+also be an aggregation. We'll see what the distinction is.
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+But basically, what this means is that we can express that
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+as a X has a y. So x contains a
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+y. And if it is in association, we indicate it with
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+a solid undirected line. If it's an aggregation,
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+we indicate it in the same way, but with
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+a diamond at one of the ends. Finally, the
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+third type of relationship is what is called Generalization.
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+And this can be expressed as x is a
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+y. So this is the relationship that expresses inheritance.
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+Specialization between two classes. It's represented with a solid
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+directed line with a large open arrow head at
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+the end. Going from the more specialized class to
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+the less specialized class. So going from the subclass to
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+the super class. So now let's look at each relationship
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+in more detail using our example, our course management system.