Light is generally considered to be an electromagnetic wave, and as such, it is described by vector quantities.
An electromagnetic wave, including light, is characterized by its electric and magnetic fields oscillating perpendicular to each other and to the direction of propagation. These fields have both magnitude and direction at each point in space and time. Therefore, light is typically represented as a vector quantity.
For example, the electric field vector of a light wave describes the strength and direction of the electric field at a given point in space as the wave propagates. Similarly, the magnetic field vector describes the strength and direction of the magnetic field.
It's worth noting that in some cases, light can be approximated as a scalar quantity when considering certain aspects, such as intensity or power, which are scalar quantities derived from the vector nature of light. However, when considering the wave nature and propagation of light, vector quantities are used to fully describe its characteristics.