Modding is a slang expression that is derived from the verb "". Modding refers to the act of modifying hardware, software, or virtually anything else, to perform a function not originally conceived or intended by the designer, or achieve a bespoke specification. The term modding is often used within the computer game community, particularly in regard to creating new or altered content and sharing that via the web. It may also be applied to the overclocking of computers in order to increase the frequency at which the CPU operates. Case modding is also a popular activity amongst many computer enthusiasts which involves the customization of a computer case or the installation of water cooling technology. In connection with automobiles, modding often refers to engine tuning, remapping of a vehicle's engine control unit or customization of the bodywork.