collection is a systematic approach to collecting data from a wide variety of sources in order to obtain as accurate an overview as possible of a certain level of information. Data collection is based on conversations and interviews, surveys of individuals and companies, observations, documents, studies, expert opinions, statistics and publications in various print, electronic and online media
As for primary data, it is data obtained through surveys and interviews and not yet published. Secondary data are different. They have been taken from publications and have already been statistically analysed. Quantitative data is about numerical data from tables and statistics, and qualitative data is about descriptive data that describes the appearance in color, shape or smell.