In cooking, a wire whisk is used for ALL sorts of things. It is a multi-purpose tool that has a place in every kitchen. It can be used to beat eggs for an omelette, make buttercream, create foamy or stiff-peaked egg whites, whip cream, or essentially add air into any kind of batter or substance.

A handheld wire whisk is usually made of stainless steel, although some varieties are coated in silicon. The silicon kinds are best sued on non-stick surfaces like pans, where a metal implement should not go. But if you only need one whisk, a standard wire whisk is the way to go.