Douching is a process of cleaning any part of your body or cavity with water or other fluids. It is done to flush out, clean or rinse any body part. This is majorly done in the anus to clean the anus and the rectum completely. However, it should be noted that vaginal douching is dangerous and can cause an imbalance in the natural pH and bacteria of the vaginal canal leading to chronic infections.
Sources:
https://www.healthline.com/health/womens-health/what-is-a-douche#function
https://www.medicalnewstoday.com/articles/320998
https://www.medicinenet.com/female_sexual_problems_pictures_slideshow/article.htmm