https://www.ohio.edu/cas/linguistics/corpus-tools-guides
What is corpus linguistics?
Corpus linguistics is a methodology that involves computer-based empirical analyses (both quantitative and qualitative) of language use by employing large, electronically available collections of naturally occurring spoken and written texts, so-called corpora. https://www.english-linguistics.uni-mainz.de/corpus-linguistics/#:~:text=What%20is%20corpus%20linguistics%3F,texts%2C%20so%2Dcalled%20corpora.
Get a practical introduction to the methodology of corpus linguistics for researchers in the social sciences and humanities.

Why corpus linguistics? Corpus linguistics allows us to see how language is used today and how that language is used in different contexts, enabling us to teach language more effectively. Taken From https://www.press.umich.edu/pdf/9780472033850-part1.pdf