In Diablo 4, items, and especially unique and legendary items are one of the ways to improve the combat abilities of your character. Unique items are rare and have fixed stats that are predetermined, while legendary items are even rarer and have unique affixes that provide powerful bonuses or abilities.
These items are highly desired by players because they can significantly boost your character's power and provide unique gameplay opportunities, sometimes completely redefining the way a character is played. Additionally, collecting these items can be a satisfying and rewarding experience for players who enjoy the loot-hunting aspect of the game. If you want to build the strongest character possible in Diablo 4, buying and equipping unique and legendary items should be a top priority.