DB nailed it. I'd also like to add that you can always replicate enchantments from older games via a variety of things in Skyrim. For example, Weakness to Frost enchantments aren't a thing in Skyrim, but Weakness to Frost Poisons are. Likewise, Disintegrate Armor doesn't exist in Skyrim, but Marked For Death does.
DB nailed it. I'd also like to add that you can always replicate enchantments from older games via a variety of things in Skyrim. For example, Weakness to Frost enchantments aren't a thing in Skyrim, but Weakness to Frost Poisons are. Likewise, Disintegrate Armor doesn't exist in Skyrim, but Marked For Death does.