Freelance marketplaces (crowdsourcing or outsourcing marketplaces) are websites that match buyers and sellers of services provided via the internet. Service providers, or sellers, create a profile where they include a description of the services which they offer, examples of their work and in some cases information about their rates. Buyers register and complete a basic profile, they then post projects outlining their requirements. Buyers will then bid for these projects on a fixed price or hourly basis.
References
Freelance marketplace Wikipedia(Text) CC BY-SA