Silica aerogel is a lightweight, porous material made from silica, the same substance found in sand. It is known for its exceptional insulating properties, making it an effective thermal insulator. Silica aerogel is often referred to as "frozen smoke" due to its translucent appearance and low density. This material is used in various applications, including space exploration, where it helps protect spacecraft from extreme temperatures. Additionally, silica aerogel is utilized in building insulation and oil spill cleanup due to its ability to absorb liquids and gases efficiently. Its unique properties make it a valuable material in many industries.