An influencer in marketing is an individual who has the power to affect the purchasing decisions of others because of their authority, knowledge, position, or with their audience. They typically have a substantial following on social media platforms and engage with their community by sharing content that resonates with their interests. Brands collaborate with influencers to promote products or services, leveraging their reach and credibility to connect with potential customers in a more authentic way. This form of marketing taps into the trust that influencers have built with their audience, making it an effective strategy for reaching targeted demographics.