55/68 as a percentage is 80.88%. This means the fraction is a little over four‑fifths of a whole.
When you think of 55 out of 68 parts, you are looking at a fairly large portion. It’s close to 81 out of 100, so it feels like a strong majority.
You might see this kind of number in school grades, survey results, or any place where you compare a part to a whole. Knowing the percent makes it easy to compare with other numbers that are already expressed in percent.