In the most basic terms, quantitative research methods are concerned with collecting and analysing data that is structured and can be represented numerically. One of the central goals is to build accurate and reliable measurements that allow for statistical analysis.
Because quantitative research focuses on data that can be measured, it is very effective at answering the "what" or "how" of a given situation. Questions are direct, quantifiable, and often contain phrases such as what percentage? what proportion? to what extent? how many? how much? See Goertzen (2017)