Crowdsourcing is a distributed problem-solving and production model. The problems are broadcast to an unknown group of solvers in the form of an open call for solutions. Users also known as the crowd typically form into online communities, and the crowd submits solutions.
Paid To Click is an online business model that draws online traffic from people aiming to earn money from home. Paid-To-Click, or simply PTC websites, act as middlemen between advertisers and consumers; the advertiser pays for displaying ads on the PTC website, and a part of this payment goes to the viewer when he/she views the advertisement.
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Freelance is somebody who is self-employed and is not committed to a particular employer long term. Freelancers generally enjoy a greater variety of assignments than in regular employment, and subject to the need to earn a regular income usually have more freedom to choose their work schedule.