The majority of objects are opaque, which means you can't see through them. This is due to the fact that light can't pass through them. Examples of opaque objects include wood, gold, cement, metal, some types of colored plastic, vegetation and so on.
When light strikes an opaque object it is either absorbed by the object or it is bounced off or reflected by the object. For example, white objects reflect light, which is why they are cooler to the touch. Dark objects absorb light and transform it into heat. Other objects absorb some wavelengths of light while deflecting others.
The way that an object reflects light is divided into three groups: transparent, translucent and opaque. An example of an opaque object is an apple. When we look at an apple, the color reflected is red. This is because all of the other colors in the light spectrum are absorbed by the apple. When we see white objects, that means that all of the colors in the spectrum are reflected. Another example is wood. Wood stores the light that is collected. The thermal energy becomes fire.