An alumni network is important for high schools to have loyal supporters, positive word-of-mouth marketing, and role models for current students. The document discusses how KIS, a high school established in 1901 in India engages with its over 7,000 worldwide alumni. KIS aims to network with alumni to build lasting friendships and gain their contributions of ideas, time, donations and fundraising. KIS engages alumni through infrastructure like an alumni office and chapters, and events like gatherings, reunions, and mentoring current students. Publications and social media are also used to connect with alumni.