Secure Sockets Layer (SSL), are cryptographic protocols which provide secure communications on the Internet for such things as web browsing, e-mail, e-commerce and credit card transactions, and other data transfers.
SSL (Secure Sockets Layer) is the industry standard for online security. If you are doing any business on the internet then you will need an SSL Certificate, which shows your customers that you value the confidentiality of their data. The goal of an SSL Certificate is to keep the exchange of sensitive information encrypted and secure.
While most often assoiciated with online credit card purchasing, SSL security can be applied to your emai accounts, FTP and for your VPN (Virtual Private Network) or Extranet equipment.