What is the relationship between glass and the fiberglass we commonly use?

Although glass and fiberglass are both composed of silica (SiO₂), they have significant differences in structure and use.
Fiberglass are made by heating glass to a molten state and then drawing it into filaments just a few microns in diameter. The tensile strength of these fibers (2000 to 3000 MPa) is 200 to 750 times higher than that of ordinary glass, and the density (2.4 to 2.7 grams per cubic centimeter) is lower than that of most metals, making them widely used in aerospace, construction and construction. It is widely used in electronics and other fields.
In addition, fiberglass also has excellent heat resistance and electrical insulation properties, with a softening point between 550 and 850 degrees Celsius, and is almost non-conductive.
These two properties make fiberglass also important in making high-performance composites and insulation materials.
In contrast, ordinary glass is mainly used for windows, bottles, decorations, etc.