The Tri-Component Model (TCM) will be used in this study to examine the effects of online influencer marketing on young adult consumers' perceptions towards businesses. According to the TCM, attitudes are made up of three parts: emotional, behavioural, and cognitive. A thorough review of the literature revealed that young adults' attitudes towards brands are influenced by a variety of factors, including perceived influencer credibility and attractiveness, perceived product quality, social identity, trust in the influencer, perceived expertise of the influencer, perceived similarity to the influencer, brand-consumer fit, emotional connection to the influencer, and incongruity between the influencer and the product being marketed. Additionally, a consumer's attitude towards a business might affect their buying intention, and the effectiveness of online influencer marketing can differ based on the kind of product being promoted. The results imply that for companies aiming to reach young individuals, online influencer marketing may be a more affordable option than traditional advertising. This study adds to the body of knowledge on online influencer marketing by giving a thorough understanding of the factors that affect young adults' attitudes towards brands and emphasizing the significance of taking TCM into account when analysing how online influencer marketing affects consumer attitudes