The presentation discusses complementary and alternative modalities, defined as diverse medical and health care systems not typically included in conventional medicine. It elaborates on various modalities, including alternative medical systems like Ayurveda and Siddha, biological-based treatments, mind-body techniques, manipulative methods like yoga, and energy therapies such as acupuncture, all aimed at improving health and quality of life. The document also highlights the reasons for using these alternative approaches, including dissatisfaction with conventional medicine and the desire for natural healing methods.