Modding

Modding is a slang expression that is derived from the verb "modify". 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 used within the computer game community, particularly in regard to creating new or altered content and sharing that via the web. It may be applied to the overclocking of computers in order to increase the frequency at which the CPU operates. Case modding is a popular activity among many computer enthusiasts which involves the customization of a computer case or the installation of water cooling technology. In connection with automobiles, modding can mean engine tuning, remapping of a vehicle's engine control unit or customization of the bodywork. Some people modify small electronic handheld toys by circuit bending, changing the circuits and adding a knob or switch that will change the produced pitch up or down.

A common example of one kind of modding is video game console mod chips, which can allow users to play homemade games, games legitimately purchased in other regions, or legal backup copies, but can also allow illegal unauthorized copies by allowing the player to play personally recorded CD or DVD copies of video games. Modchips, in their current form, were first available for the Sony PlayStation (and later the PlayStation 2). Various other types of copyright circumvention systems also existed for the Nintendo 64 and the older Game Boy consoles (though neither include actual modding, but instead backup devices).

Average modding
Using Toad's Tool 64 or other modding programs you can change textures and sometimes even models to how you like them! You can change level layouts sometimes too! Lots of the pages on the wiki are modded.