 High again. In this lesson, we're going to talk about that how to find the union of two lists in Python. First, let's say that everything in Python is an object. Then, everything in Python can be grouped into a set. What is set? Set is a collection of unique elements. So, let's say that we have set represented by list A, and that list A is populated with elements, letters A, B and C. So, we have set A, it looks like this, it has elements A, B and C, and we put that set inside this list A. Okay, now let's define our list A and populate it with elements A, B and C, as shown in this example. Okay, let's go back to this. So, now we have our list A with elements A, B, C. Then, let's say that we have another set represented by list B. List B equals, and we'll populate it with elements A, C and E. Our set will look like that, and we'll populate our list with those elements inside this set. So, let's make list B with elements of A, C and E. First, third and fifth letter of the alphabet. We have two sets stored in our lists list A and list B. Now, let's back to the slide. Okay, now we want to find the union of sets A and B. Union of sets A and B are all elements of set A and all elements of set B. And we can also say that A union B, that means, or it included all elements of set A and all elements of set B. So, if element is inside A union B, that means that element is in set A or element is in set B. Look that word OR, we have in Python operator for OR. Okay, let's go to Python IDLE and let's make union of those two lists. Let's put our list A to be set and put our list B to be set. And now we want to make union between those two sets and we said that element is in set A or element is in set B. In Python, if you want to use operator OR, you will use that sign. That means that element is inside list A or set A or inside list B or set B. And let's print that our union to the screen. Let's press enter and now we have union of sets A and B represented as lists in Python. That's all in this lesson. Thanks for watching. Happy coding.