Whisks are a relatively new addition to the modern kitchen. Although the idea of a whisk has been around since at least the 18th century, Julia Childs introduced the whisk into American kitchens in 1963 when she used a wire whisk to prepare omelets instead of electric egg beaters.
More air is beat into the eggs using this method, and the omelet is much lighter when you use a wire whisk.
Most whisks are made from stainless steel wire, but they are made from other materials, including wood and nylon plastic, or silicone-coated wire.
Keep in mind that, since most whisks are made of metal, they are not good for the non-stick coating of your pots and pans.