A Certificate of Eligibility is issued by Japanese immigration authorities to show that a foreigner meets requirements for a status of residence. It streamlines the visa application process by reducing inquiries and allowing easier landing permission. However, the certificate does not guarantee visa issuance or entry to Japan. Upon entry, the visa is canceled and replaced with a residence card showing permission to stay, with some exceptions for multiple entry visas. The certificate simplifies but does not ensure the immigration process and is only valid for three months from issuance.