You may have thought of it as insignificant, but I can assure that it's not.
Take a look at these examples below.
You can barely see the tiny writing on the bottom (I enlarged the writing underneath for those who can't see it), so naturally, it must be insignificant, right?
Uh, NO. While all of these fancy French names are there, no one seems to pay much attention to them.
If you head on out to Sephora, Ulta, or even Target or Walmart and walk on over to the perfume section, you'll see several different labels on the boxes and bottles. And these, my dear friends, are what will tell you exactly everything you ever wanted to know about the perfume.
Overall, if you're looking for something that'll last the entire day, and you're willing to dish out some cash, perfume or eau de parfum is your best bet, while if you're just looking for something fun, eau de toilette and body splash is a great way to go. Here are some examples of what's-what from some popular brands and companies.
At the end, when it comes to price, you dish out more for a longer-lasting scent. I hope this cleared up any confusion, or just educated you on the art of perfumery.