Iridium is about 8X harder than platinum and does not erode nearly as fast as platinum. I have no doubt that your engine came with iridium plugs.
What that means is that the center electrode, the one that the spark arcs from, doesn’t get vaporized by the heat of the arc as fast as the platinum does. However, the ground electrode, the one to which the arc travels, is still platinum and still erodes… but since the arc travels to it rather than from it the material doesn’t get removed. Ergo, erosion overall is much slower.
Irridium plugs don’t need to be changed as often as platinum plugs, but they still need to be changed occasionally. The spark still causes erosion, and contamination is still a factor. Your owner’s manual will tell you how often, but typically it’s around or in excess of 100,000 miles. Personally, I like 60,000 miles. As I mentioned, contamination from the combustion process is still a factor, and plugs are cheap.
For the make, I recommend only NGK or Denso plugs. They’re OEM to many Japanese manufacturers (I realize Hyundai isn’t Japanese) and I’ve had much more reliable performance from them than I have from other makes.
I saw two different 4-cylinder engines listed for the 2013 Santa Fe, and you didn’t mention which you had, so I’ll leave looking up the plugs up to you.