Information (often stored as a text file) that is used by the SSL protocol to establish a secure connection. Often used for e-commerce.
Secure sockets layer, SSL, uses security certificates, often stored as text files to establish a secure, or encrypted connection on the web.
Site certificates form an essential part of providing reassurance that the site you are visiting is genuine. A site certificate shows you that a secure connection has been established and secure communication can take place. It will also demonstrate that you are not being tricked to enter your details on a fraudulent website.