78/79 as a percentage is 98.73%. This tiny fraction shy of a whole shows just how close the number is to 100 %.
When you see a value like 98.73%, it tells you that the part you have is almost the entire set. In practical terms, if you had 79 items and you possessed 78 of them, you’d be holding nearly all of them.
People often use such high percentages to indicate strong agreement, near‑complete completion, or very high accuracy. It’s a quick way to communicate that something is practically whole, without being exactly 100 %.