By Danilo Alfaro
Definition: An immersion blender is a kitchen tool used for blending soups, sauces and other liquids. An immersion blender is basically a stick with blender blades at the end of it.
How an immersion blender differs from a regular blender is that rather than pouring the liquid into the blender and turning it on, the immersion blender is inserted into the container of liquid (like a pot of soup, for instance) and turned on. You would then sort of swirl the immersion blender throughout the liquid to ensure that it's uniformly blended.
An immersion blender is helpful when you have a large amount of pureed soup or some other product to work with — more than one blender, which would require blending in batches. Then you have to use yet another container for holding the blended soup while you finish the job. Which means using the first (unblended) container, the second (blended) container, plus the blender itself. Using an immersion blender allows you to simply blend the soup in its original pot.
A good immersion blender should be powerful enough to process all kinds of foods, including cooked meats, potatoes, vegetables, and so on. Some home immersion blenders are intended mainly for blending drinks, making smoothies and so on. Obviously, the more heavy-duty models will be more expensive.
Original article from: http://culinaryarts.about.com/od/glossary/g/Immersion-Blender.htm