If you offer products and services on your site and you would like the payment info that customers submit to be secure, you should use an SSL certificate. Secure Sockets Layer is a protocol that encodes the info exchanged between a user and a server, but in order to get an SSL, you'll need a Certificate Signing Request (CSR). This is Base64 encoded info that the SSL service provider will use to issue the certificate. The CSR consists of the web address, Business name and Unit, postal address and e-mail of the business which will use the certificate. The Certificate Authority reviews and approves the CSR before it gives an SSL certificate that is signed electronically with its private key as an authority. To be able to install an SSL, you'll need an overall of 4 batches of code - the CSR, a Private Key that is made after you generate the Request, the actual certificate along with a special Certificate Authority code, that is unique for each vendor.