Hydrocolloids are a class of polymers that form a water-insoluble gel when in contact with water. This gel has many properties that make it a popular wound dressing choice, including the ability to form a protective barrier against bacteria and to promote healing. Hydrocolloids are available in a variety of forms, including gels, foams, and films, and can be applied using a variety of techniques, including spraying, brushing, and pouring.