Certificate-Expired-IMAPS/EN/Background

Server Certificates provide more security on the Internet and serve to verify servers. A certificate is issued by official, trustworthy institutions and verifies the identity of the website. A certificate is not forgeable. In normal life, a certificate is comparable to an identity card or a notarial certification. Similar to a passport, certificates also have a certain validity period. Certificates thus ensure secure data exchange and form an important basis of trust for operators of e.g. online shops.