Elance is a leading online marketplace that connects small businesses with freelance service providers from around the world using a crowdsourcing model. It allows buyers to outsource projects and find skilled freelancers to complete the work. Elance offers features like chat, video calling, and skills certification tests to help match buyers with providers. It also provides an escrow system for payments and project tracking tools for monitoring milestones and deliverables. While crowdsourcing provides benefits like access to an international workforce, it also presents disadvantages for buyers and providers.