Quantitative Data: Focuses on collecting data for numerical analysis. Quantitative data provides useful statistics which help organisations assess demand/useage and plan how many of something is needed
Qualitative Data: Focuses on people's opinions and attitudes towards a product or service. It is unlikely to be statistically accurate but that does not matter as its job is to provide information about people's views and opinions. People's views and opinions help organisations assess the "public's mood", decide strategy and design products and services.