Explore the intricate connections between theta lifting and Langlands functoriality in this 44-minute lecture by Atsushi Ichino. Delve into key concepts such as seesaw identities, modular forms of half integral weight, and the local Shimura-Waldspurger correspondence. Examine the geometric realization of Langlands functoriality and revisit the Jacquet-Langlands correspondence, gaining deeper insights into these advanced mathematical topics.