What is a certificate and how does it work?
Certificates are a tool for EVE pilots to allow them to, at a glance, identify which skills or set of skills are recommended for a ship, item or activity the certificate is associated with. They allow for easier skill planning and help pilots to keep tabs on what skill sets they already possess.
You can view all your certificate information from the certificates window in your character sheet located directly under your skills window. From this window, you can view all your current certificates and their status under the certificates tab.