| Word | Description |
| Second-Level Domain (SLD) | Located immediately to the left of the dot (" . "), the second-level domain is the readable part of the domain name. The registrant defines the second-level domain. It typically refers to the organization or entity associated with the IP address. For example, in www.cnn.com "cnn" is a second-level domain. Second-level domains can be divided into further domain levels (for example, www.sportsillustrated.cnn.com). These sub domains sometimes represent different computer servers within departments. More than one second-level domain name can be used for the same IP address. |
| SSH | SSH (Secure Shell) is a program that you can use to log in to another computer over a network so that you can execute commands on a remote machine and move files from one machine to another. |
| SSL | SSL stands for Secure Sockets Layer. SSL is the de facto standard for creating a secure, encrypted link between a Web server and a browser, which ensures safe passage of sensitive information, such as credit card numbers. E-commerce Web sites, banks, etc. use SSL as a means to protect online transactions with their customers. Once a secure connection is established, SSL encrypts information sent from your browser to the Web server. |
| SSL Certificates | An SSL certificate is a digital certificate that authenticates the identity of a Web site and encrypts information that is sent to the server using Secure Sockets Layer (SSL) technology. SSL certificates—built around stringent, industry-leading authentication measures—allow Web site owners to secure all online transactions with up to 256-bit encryption. An SSL certificate on a Web site ensures that sensitive data is safe from prying eyes. |