Quantitative data
Quantitative data is information about quantities; that is, information that can be measured and written down with numbers. Some examples of quantitative data are your height, your shoe size, and the length of your fingernails or the number of times you do something.
Qualitative data
Unlike Quantitative data, Qualitative research gathers information that is not in numerical form. For example, diary accounts, open-ended questionnaires, unstructured interviews and unstructured observations. Researchers use qualitative data techniques when they want to find reasons, causes or feelings about the subject they are researching. It is often collected as participant stories or feelings about the subject being researched.
A good example of the use of both quantitative data and qualitative data is the travel website, Tripadviser, which asks travellers to rate accommodation, restaurants and public places using numerical data such as a 1-5 Likert scale, but will then ask for a qualitative answer in review form about their stay/meal/trip.