A wiki is a website that provides collaborative modification of its content and structure directly from the web browser.

In a typical wiki, text is written using a simplified markup language (known as "wiki markup") and often edited with the help of a rich-text editor.

A wiki is run using wiki software, otherwise known as a wiki engine.

There are dozens of different wiki engines in use, both standalone and part of other software, such as bug tracking systems.

Some wiki engines are open source, whereas others are proprietary.

Some permit control over different functions (levels of access); for example, editing rights may permit changing, adding or removing material.

Others may permit access without enforcing access control.

Other rules may also be imposed to organize content.

A wiki engine is a type of content management system, but it differs from most other such systems, including blog software, in that the content is created without any defined owner or leader, and wikis have little implicit structure, allowing structure to emerge according to the needs of the users.

Cheating in online games is defined as the action of pretending to obey the rules of the game, while secretly subverting them to gain an unfair advantage over an opponent.

Depending on the game, different activities constitute cheating and it is either a matter of game policy or consensus opinion as to whether a particular activity is considered to be cheating.

In computing, source code is any collection of computer instructions, possibly with comments, written using a human-readable programming language, usually as ordinary text.

The source code of a program is specially designed to facilitate the work of computer programmers, who specify the actions to be performed by a computer mostly by writing source code.

The source code is often transformed by an assembler or compiler into binary machine code understood by the computer.

The machine code might then be stored for execution at a later time.

Alternatively, source code may be interpreted and thus immediately executed.

A security hacker is someone who seeks to breach defenses and exploit weaknesses in a computer system or network.

Hackers may be motivated by a multitude of reasons, such as profit, protest, information gathering, challenge, recreation, or to evaluate system weaknesses to assist in formulating defenses against potential hackers.

The subculture that has evolved around hackers is often referred to as the computer underground.

An Internet forum, or message board, is an online discussion site where people can hold conversations in the form of posted messages.

They differ from chat rooms in that messages are often longer than one line of text, and are at least temporarily archived.

Also, depending on the access level of a user or the forum set-up, a posted message might need to be approved by a moderator before it becomes visible.