To understand the percentage difference between two numbers, we first need to know what percentage means. Percentage is a way of expressing a number as a fraction of 100. For example, 50% means 50 out of 100 or 0.5 as a decimal.

Now, let's look at the problem at hand. We are given two numbers, 63 and 58, and we need to find the percentage difference between them. To do this, we first need to find the difference between the two numbers.

63 - 58 = 5

So the difference between 63 and 58 is 5.

Next, we need to find what percentage of 63 the difference of 5 represents. To do this, we divide the difference by 63 and then multiply by 100 to get the percentage.

(5/63) x 100 = 7.94%

Therefore, the percentage difference between 63 and 58 is 7.94%. This means that 58 is 7.94% less than 63.

I hope this explanation helps you understand the concept of percentage difference and how to calculate it.