When you turn the fraction 7⁄18 into a percent, you get 38.89%. This is the rounded value you would see on most calculators or in reports.
The fraction 7⁄18 means seven parts out of a total of eighteen equal parts. It is a little less than half, because half would be 9⁄18. Seeing it as a percent helps compare it to other numbers that are already in percent form.
In everyday use, 38.89% might represent a score, a portion of a budget, or a success rate. Knowing both the fraction and its percent version makes it easier to talk about the same amount in different ways.