A **certificate of sponsorship** (https://www.visasimple.com/certificate.html) is essential for skilled workers applying for a UK work visa. Issued by a licensed employer, it confirms job details and compliance with immigration rules. Employers must register with the Home Office to sponsor workers legally. Each certificate is unique and linked to a specific role. Applicants use this reference number when applying for a visa. Sponsorship duties include monitoring employees and ensuring legal work status. Failing to meet requirements can lead to penalties. Proper documentation and compliance with sponsorship regulations increase the chances of a successful work visa application.