COVID-19 Certificates are official documents that indicate an individual's vaccination status, recent negative test results, or recovery from COVID-19. These certificates are often required for travel, entry into certain venues, or participation in events, helping to ensure public safety by verifying health information. Many countries have adopted digital formats for these certificates, making them easily accessible through mobile apps or websites. The European Union introduced the EU Digital COVID Certificate to facilitate safe travel among member states, while other regions have developed similar systems to manage public health during the pandemic.