No product can be sold without effective marketing, which heavily relies on advertisements and promotions. Advertising agencies specialise in creating and executing advertising campaigns for their clients, using various media channels such as television, radio, print, and digital platforms to reach their target audience. They also conduct market research and provide strategic planning to ensure the success of the campaign. These campaigns are the fruitful results of close work with clients to understand their business goals, target market, and unique selling proposition. The list does not stop here. They also track the effectiveness of campaigns, identify areas for improvement, and provide insights that can inform future marketing efforts. Advertising agencies are thus instrumental in maximising the impact of marketing campaigns and helping their clients achieve their business objectives. Their expertise in creative development, media planning and buying, market research, and analytics makes them an essential partner for any company looking to succeed in today's competitive marketplace. This paper aims to explore the role of advertising agencies in marketing effectiveness.