The IEP defines Qualia as:

“…the subjective or qualitative properties of experiences. What it feels like, experientially, to see a red rose is different from what it feels like to see a yellow rose. Likewise for hearing a musical note played by a piano and hearing the same musical note played by a tuba… As [C. I.] Lewis [the originator of the term] used the term, qualia were properties of sense-data themselves. In contemporary usage, the term has been broadened to refer more generally to properties of experience… Qualia are often referred to as the phenomenal properties of experience…”

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