13/79 as a percentage is 16.46%. This means that if you split something into 79 equal parts, taking 13 of those parts would be just a little over one‑sixth of the whole.
The fraction 13/79 is a small slice—smaller than 1/5 but larger than 1/7. In decimal form it is about 0.1646, which matches the percentage when you move the decimal point two places to the right.
You might see a number like this when dealing with statistics, such as the proportion of a group that chose a particular option. Knowing the percentage makes it easier to understand and compare with other data.