A dumbbell is a short barbell, usually 10 - 15 inches long. Dumbbell exercises are performed with a dumbbell in each hand. Most gyms have a dumbbell rack that has an assortment of fixed weight dumbbells. They usually have dumbbells from 5 lbs. - 100+ lbs. in increments of 5 lbs. (i.e. 5 lb. dumbbells, 10 lb. dumbbells, 15 lb. dumbbells, etc...).
There are also adjustable dumbbells that have small collars that clip on the ends of the dumbbells to hold the weight plates. While they are not a convenient as a rack of fixed weight dumbbells, they are much cheaper and take up less space. They are ideal for a home gym setting. 
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