Host   A Host Computer is one which provides a particular service to a user. This includes Information or communications. HTML   Hypertext Mark-up Language. HTML is not really a programming language, but a way to format text by placing marks around the text. For example HTML allows you to make a word bold or underline it. Early word processing programs used to work this way. HTML is the foundation for most web pages. HTTP   Hypertext Transmission Protocol is a Protocol that Computers on the Internet use to communicate with each other. Hypertext   Generally, any text that contains links to other documents - words or phrases in the document that can be chosen by a reader and which cause another document to be retrieved and displayed. In an SSL connection, each side of the connection must have a Security Certificate, which each side's software sends to the other. Each side then encrypts what it sends using information from both its own and the other side's Certificate, ensuring that only the intended recipient can de-crypt it, and that the other side can be sure the data came from the place it claims to have come from, and that the message has not been tampered with.