Qualia refers to a quality, hence the name, of one persons subjective experience. Try describing, without analogy, exactly what red looks like, what chocolate tastes like, what pain feels like, or what a violin sounds like. You can’t do it because people’s connotations of the words you use to describe something are tied to their perceptions. If you say “red is the color of blood” you would be right because blood reflects light in the “red” end of the color spectrum, but your red might be another person’s purple which may be yet another person’s green. Although the philosophical debate about whether or not qualia is a real thing, whether or not someone’s perceptions of color, taste, pain or sound are inherent qualities of objects, or ascribed to such objects by the mind.