What's the difference between descriptive experiment and comparisons?

Descriptive research is a type of research that studies the participants that take part in the research or a certain situation. Descriptive research does not limit to either of quantitative or qualitative research methodologies, but instead, it uses elements of both, often within the same study. Therefore, a descriptive researcher often uses three major ways to collect and analyse the data. They are observations, case studies and surveys.

now i dont know much about comparisons but im assuming your comparing your own experiment to someone elses to see if you get the same result.