Background

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The following official WotC backgrounds are available. Creating a custom background is also allowed in cooperation with the DM.
You can read about each background here.
Acolyte
Anthropologist
Archaeologist
Astral Drifter
Athlete
Adopted
Caravan Specialist
Charlatan
City Watch
Clan Crafter
Cloistered Scholar
Courtier
Criminal
Entertainer
Faceless
Faction Agent
Feylost
Fisher
Folk Hero
Gate Urchin
Gambler
Gladiator
Guild Artisan
Guild Merchant
Harborfolk
Haunted One
Hermit
Investigator
Knight
Marine
Mercenary Veteran
Noble
Noble (Knight)
Noble (Retainers)
Pirate
Plaintiff
Rival Intern
Sage
Sailor
Secret Identity
Shipwright
Smuggler
Soldier
Spy
Student Of Magic
Trade Sheriff
Urban Bounty Hunter
Urchin