UX Research is divided into 2 types

Source : Lynda

1. Qualitative 
2. Quantitative

1. Qualitative
Qualitative researchers use a variety of methods to develop deep understandings of how people perceive their social realities and in consequence, how they act within the social world.

For example, diary accounts, open-ended questionnaires, documents, participant observation, and ethnography.

2. Quantitative
Quantitative research gathers data in a numerical form which can be put into categories, or in rank order, or measured in units of measurement.  This type of data can be used to construct graphs and tables of raw data.

This article can help you get started — the first step is determining which Quantitative UX research method you need. We’ll cover some of the most popular types of Quantitative research:

Quantitative Usability Testing (Benchmarking)
Web Analytics (or App Analytics)
A/B Testing or Multivariate Testing
Card Sorting
Tree Testing
Surveys or Questionnaires
Clustering Qualitative Comments
Desirability Studies
Eyetracking Testing

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