Composite resins are materials made by combining two or more different substances to create a new material with enhanced properties. They are commonly used in various applications, including dental fillings, adhesives, and coatings. The main components typically include a resin matrix and reinforcing fillers, which improve strength and durability. These resins can be tailored for specific uses, making them versatile in industries such as construction, automotive, and aerospace. For example, in dentistry, composite resins are favored for their aesthetic appeal and ability to bond well with tooth structure, providing a natural-looking restoration.