A firewall is a security system (typically software-based) that manages the connection between computers, networks and the Internet. Its purpose is to prevent unauthorised access and use of your computer by unauthorised individuals (or programs).
Firewall software can be programmed to prevent the download of specific file types as a virus-protection measure. This can be an issue with sites that use rich media formats (such as Flash).

Forms are the cornerstone of web-based interaction using X(HTML). They are used anywhere information is collected from users. For example, forms are commonly used to:

• subscribe to email newsletters;
• provide shipping and shopping details for e-commerce;
• conduct online surveys;
• support e-learning activities (quizzes, tests, etc.).

FTP stands for File Transfer Protocol which is one of the methods of transferring files over the Internet.