Roblox operates a human co-experience platform, or the Platform, or Roblox Platform, where users interact with each other to explore and develop immersive, user-generated, 3D experiences. Upon signing up for Roblox, a user personalizes their unique Roblox identity, or avatar. Users are then free to immerse themselves in experiences on Roblox and can acquire experience-specific enhancements or avatar items in Co.'s Avatar Marketplace using the virtual currency, or Robux. Developers build experiences published on Roblox and can earn Robux through microtransactions in their experiences, through engagement-based payouts, and by selling virtual items in the Roblox virtual economy.