 So now we're looking at Microsoft Excel, just bare bones. We've just turned it on and what are we taking a look at? Well, we see that grid like structure that we just talked about. You see that I have A1 sort of being my current cell. This is known as my active cell. And wherever I click, say for example, I click right here, notice how I'm talking about the K column and the row 24. So this is some way for me to identify. This is what I'm talking about. And one of the things I've said was, let's say I put 10 inside of C3. If I hit enter, it will go to the right alignment. And now what I can do, and I'll just zoom in a little bit so we can see this a little bit more in action. If I come over here to B4 and I go equals, now what I can do is I can actually click on C3. And instead of typing it out, I can actually just click. That's what happens. C3 automatically appears on the screen, times 10. Now, as soon as I hit enter, I'm not gonna see this. I'm gonna see 100. But notice what I had to type in there. If I had just typed in C3 times 10, I would have just gotten text. One of the things that we have to do inside of Microsoft Excel is we have to start any mathematical equation with the equals sign. That tells Microsoft Excel explicitly, hey, I'm gonna do an equation. I'm going to do some type of cell referencing. And I would like you to just at least evaluate that later. Now what I can do is inside of C3 because C3 is just a number, if I change that number to something like 20, that number changes everywhere I have it being cell reference. So I have it here. And if I were to come down here and then make a reference to that, say divided by five, and then this plus 30. If I make one simple change here, all of those numbers change because this one is dependent on this one, this one is dependent on this one, and this one is dependent on this one.