Whisk

A Whisk is a cooking utensil used in food preparation to blend ingredients smooth, or to incorporate air into a mixture, in a process known as whisking or whipping. Most whisks consist of a long, narrow handle with a series of wire loops joined at the end. The wires are usually metal, but some are plastic for use with nonstick cookware. Whisks are also made from bamboo.
Whisks are commonly used to whip egg whites into a firm foam to make meringue, or to whip cream into whipped cream.
A makeshift whisk may be constructed by taking two forks and placing them together so the tines interlock and make a cage. This is far more effective than a single fork at incorporating air into a mixture.
Whisks have differently-shaped loops depending on their intended functions:

• The most common shape is that of a wide teardrop, termed a balloon whisk. Balloon whisks are best suited to mixing in bowls, as their curved edges conform to a bowl's concave sides.

• With longer, narrower wire loops, the French whisk has a more cylindrical profile, suiting it to deep, straight-sided pans.

• A flat whisk, sometimes referred to as a roux whisk, has the loops arranged in a flat successive pattern. It is useful for working in shallow vessels like skillets (in which a roux is normally prepared).

• A gravy whisk, sometimes referred to as a spiral whisk, commonly has one main loop with another wire coiled around it.

• Similarly, a twirl whisk has one single wire that is spiralled into a balloon shape.

• Ball whisks have no loops whatsoever. Instead, a group of individual wires comes out of the handle, each tipped with a metal ball. The heavy balls are capable of reaching into the corners of a straight-sided pan. Since there are no crossing wires, the ball whisk is easier to clean than traditional looped varieties. Manufacturers of ball whisks also purport that their shape allows for better aeration.

• A Cage whisk, sometimes referred to as a ball whisk, is a balloon whisk with a small spherical cage trapped inside of if, which in turn holds a metal ball.

Additionally, a mechanical device known as a rotary whisk consists of 2 sets of beaters that are joined together with a hand-operated crank and handle.
Although the modern whisk may have only appeared at the end of the 19th century, evidence of whisk-like tools exist even further back in history. A bundle of twigs fastened together make an effective whisk; often the wood used would lend a certain fragrance to the dish. An 18th century Shaker recipe calls to “Cut a handful of peach twigs which are filled with sap at this season of the year. Clip the ends and bruise them and beat the cake batter with them. This will impart a delicate peach flavor to the cake.”

source: wikipedia