Colorless compounds are substances that do not exhibit any color in their pure form. This lack of color can be due to the absence of certain chromophores, which are parts of molecules responsible for color. Many gases, such as oxygen and nitrogen, are colorless, as are various liquids and solids, including water and some salts. These compounds can be found in various applications, from industrial processes to everyday products. For example, colorless compounds like ethanol and acetone are commonly used as solvents. Their lack of color often makes them ideal for use in situations where color might interfere with the desired outcome.