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In the context of UK immigration, a <a href="https://www.visasimple.com/certificate.html">Certificate of Sponsorship</a> (CoS) is a document issued by licensed sponsors to enable skilled workers to apply for a Tier 2 (General) visa. Employers who are licensed sponsors can assign a CoS to prospective employees from outside the European Economic Area (EEA) and Switzerland. The CoS contains details about the job, the individual's personal information, and the sponsor's information. It plays a crucial role in the visa application process, as applicants need a valid CoS to apply for a Tier 2 visa to work in the UK.