This document summarizes an influencer marketing presentation. It defines influencer marketing as brands collaborating with influencers to promote products/services. It outlines different types of influencers and current trends in influencer marketing like the rise of micro/nano influencers and video content. The document also provides a brief history of influencer marketing from the 1890s to today. It concludes by discussing top challenges in influencer marketing and providing two case studies on influencer marketing campaigns for Havells and Mastercard.