Winner of more than 200 Game of the Year Awards, Skyrim Special Edition brings the epic fantasy to life in stunning detail. The Special Edition includes the critically acclaimed game and add-ons with all-new features like remastered art and effects, volumetric god rays, dynamic depth of field, screen-space reflections, and more. Skyrim Special Edition also brings the full power of mods to the PC and consoles. New quests, environments, characters, dialogue, armor, weapons and more – with Mods, there are no limits to what you can experience.
The Anniversary Edition includes a decade’s worth of content: the critically acclaimed core game, pre-existing and new Creation Club content, plus all three official add-ons: Dawnguard, Hearthfire, and Dragonborn.
Features and bug-fixes introduced in the Anniversary update:

General performance optimizations
Minor art and lighting fixes
Adjusted creation quests so they no longer start upon leaving Helgen
Bug fixes and balance updates to the following Creations:

Daedric Mail
Elven Hunter
Ebony Plate
Ebony Plate
Arcane Archer Pack
Bone Wolf
Dawnfang & Duskfang
Dead Man’s Dread
Chrysamere
Civil War Champions
Divine Crusader
Forgotten Seasons
Goblins
Hendraheim
Myrwatch
Pets of Skyrim
Plague of the Dead
Rare Curios
Ruin’s Edge
Saints and Seducers
Saturalia
Spell Knight Armor
Staff of Sheogorath
Stendarr’s Hammer
Sunder & Wraithguard
Survival Mode
Tundra Homestead