78/95 as a percentage is 82.11%. This number tells you how much of a whole the fraction represents when you look at it in terms of 100 parts.
The fraction 78/95 can be thought of as 78 pieces out of a total of 95 equal pieces. When you compare it to a full set of 100 pieces, it is just a little over 82 pieces, which is why the percentage is close to 82.
Knowing the percentage makes it easier to compare this value with other numbers that are already expressed out of 100. It’s a quick way to see that 78/95 is a fairly large portion, but not quite a whole.