Upwork is an online platform that connects freelancers with clients looking for various services. It allows businesses to post job listings for tasks such as writing, graphic design, programming, and marketing. Freelancers can create profiles showcasing their skills and experience, making it easier for clients to find suitable candidates for their projects. The platform operates on a bidding system, where freelancers submit proposals to clients, outlining their qualifications and rates. Once hired, they can collaborate through the site, which also provides tools for tracking work hours and managing payments. This makes Upwork a popular choice for both freelancers and businesses seeking flexible work arrangements.