Sound and light are different types of waves and are classified differently.
Sound waves are mechanical waves that require a medium, such as air, water, or solids, to propagate. They are produced by the vibration of particles in the medium and travel through the medium as a series of compressions and rarefactions. Sound waves are considered matter waves because they involve the physical displacement of particles in the medium through which they travel.
On the other hand, light waves are electromagnetic (EM) waves. They do not require a medium and can propagate through vacuum as well as through transparent media such as air, water, and glass. Light waves are composed of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation. These waves are characterized by their wavelength and frequency and exhibit properties such as reflection, refraction, diffraction, and interference.
In summary, sound waves are considered matter waves because they require a material medium, while light waves are classified as electromagnetic waves due to their nature as oscillating electric and magnetic fields.