Qualitative data is a type of data collected that shows or reveals certain characteristics, properties, attributes, features, etc. of a particular phenomenon. This type of data can't be generated through measurements, and they can't be represented by numerical values. Qualitative data is mostly generated or gathered by using different kinds of methods such as observations, interviews; whether one-to-one or the one that is centered on groups, etc. This type of data is usually based on things like physical traits, sex, color, etc.
Qualitative data can only be used to describe certain qualities or characteristics of a particular phenomenon. Quantitative data, on the other hand, is a type of data that can be measured, counted, which can be expressed using numbers. Unlike qualitative data can be represented with a number of code, name, or symbol, quantitative data can be represented by using graphs, charts, histograms, etc. Qualitative data cannot be relied on always, and that is why both quantitative and qualitative data are used together.