Filter
A program that accepts a certain type of data as input, transforms it in someway and then outputs the transformed data. For example, a program that sorts names is a filter because it accepts the names in unsorted order, sorts them, and then outputs the sorted names. Utilities allowing the import or export of data are also sometimes referred to as filters. Asp e-Commerce solutions generally include a filter to block attacks.

Firewall
A system designed to prevent unauthorised access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorised internet users from accessing private networks connected to the internet (eg intranets). All messages entering or leaving the intranet pass through the firewall which examines each message and blocks those that do not meet the specified security criteria.

Flame
A searing email or newsgroup message in which the writer attacks another participant in overly harsh and often personal terms.

Forum
An online discussion group which functions like a bulletin board where users with common interests can submit postings and messages for all the others to read and discuss. Paypal Shopping Cart solutions.

Frame
A particular format for a webpage. Frames enable linking by importing a framed segment of a third party's site into a local website for viewing.