You know how sometimes you have a bunch of different ways to say the same thing, but it can get confusing? Well, in math there's something called "canonical form" which is like having a special way of saying something that everyone agrees on so there's no confusion.
Let's say you have an equation like 2x + 4 = 10. You could rearrange it to be 2x = 6, or x = 3. Those are all correct, but they're not in "canonical form."
To put it in canonical form, we usually want to get it to look like this:
x = some combination of numbers and maybe some letters
So, in this case, we can rewrite our equation as:
x = 3
That's in canonical form because it's a simple, easy-to-understand way of saying what x equals.
Basically, canonical form is just a standardized way of writing things in math so we can all be on the same page and understand what's going on!