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Unearthed Arcana refers to two different books.

Unearthed Arcana (AD&D)[]

The original Unearthed Arcana was an expansion to the Player's Handbook that introduced the barbarian and cavalier classes. It also introduced the concept of classes and sub-classes.

Unearthed Arcana (3rd edition)[]

The 2004 edition, which consists of almost entirely OGC, offered a host of optional rules and variants for the third edition rules.

Unearthed Arcana (web series)[]

The name has also been used for a series of web enhancements featuring optional or un-playtested rules.