Whisking is a technique of blending ingredients by hand to mix or fluff. It often serves to smooth the mixture or add air. It also helps to eliminate lumps in gravy often from the flour or cornstarch.
A whisk is a kitchen tool, most often made of metal, with a long, thin handle with wire loops joined at the end that form a large teardrop shape. Some newer whisks are coated with plastic for use with Teflon pans, metal can scratch the Teflon coating.