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The term qualitative is used to describe a type of empirical knowledge. Qualitative data are described in terms of quality (that is, 'informal' or relative characteristics such as warmth and flavour). This is the converse of quantitative, which more precisely describes data in terms of quantity (that is, using 'formal' numerical measurement).
Qualitative data are generally (but not always) of less value to scientific research than quantitative data, due to their subjective and intangible nature.
It is possible to approximate quantitative data from qualitative data - for instance, asking people to rate their perception of a sensation on a Likert scale
Examples
A quantitative way to report room temperature would be "the temperature in this room is 23 degrees Celsius."
A qualitative way to report room temperature would be to say "this room is comfortably warm," or "this room is warmer than it is outside".
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