1. Composition: Both glass and fiberglass are made from glass, which is a non-crystalline solid material composed of silicon, oxygen, and other elements. However, fiberglass also contains other materials, such as resins and fibers, to enhance its strength and durability.

2. Properties: Glass and fiberglass have similar physical properties, such as being brittle, transparent (in the case of glass), and having a high melting point. However, fiberglass is much stronger and more impact-resistant than glass, making it a popular choice in a wide range of applications.

3. Applications: Glass and fiberglass are used in a variety of applications, such as in construction, automotive manufacturing, and aerospace industries. Glass is commonly used in windows, mirrors, and other decorative items, while fiberglass is used in insulation, reinforced plastics, and pipes.