They don’t taste different but they have different levels of saltyness for the same weight/volume because the crystals are shaped different. The shape also affects how they dissolve and spread out over your food.
Table salt is tiny crystals that dissolve quickly for mixing in to sauces or soups.
Sea salt is wide thin flakes, it’s good for when you want to coat the top of something evenly like a sea salt caramel.
Kosher salt is large crystals that dissolve slower, it’s good for drawing moisture out of meat or veggies via osmosis (the original purpose of kosher salt is to remove blood from meat to make it kosher).