An influencer is someone who has the power to affect the buying decisions of others because of their authority, knowledge, position or relationship with their audience. Influencers can be everyday consumers who have large social media followings, or they can be industry experts with years of experience.The term "influencer" is often used in marketing, and it can refer to individuals or groups. Marketers may seek out influencers to help promote their products or services. An influencer with a large social media following can reach many people and generate interest in a product or service. Industry experts can also influence potential customers by sharing their expertise and knowledge about a particular product or service.