Indian Navy receives its 11th P-8i aircraft from Boeing- Know why are P-8i's important for India?

The anti-submarine warfare aircraft is third aircraft to be delivered under the contract for four additional Boeing aircraft ordered by India in 2016. 

source https://www.jagranjosh.com/current-affairs/indian-navy-receives-its-11th-p8i-aircraft-from-boeing-know-why-are-p8is-important-for-india-1634620329-1