The rapid advancement of digital technologies, widespread internet accessibility, and increasing smartphone penetration have significantly transformed marketing practices and consumer behaviour worldwide. Traditional offline marketing methods, including print media, television, radio, outdoor advertising, and direct selling, are increasingly being complemented or replaced by online marketing strategies such as social media marketing, search engine optimization, email marketing, pay-per-click advertising, and e-commerce platforms. The present study aims to comparatively analyze online and offline marketing approaches and examine their influence on changing consumer behaviour. The research explores key differences in reach, cost, interaction, measurability, and targeting capabilities between the two marketing paradigms. Furthermore, it investigates how digitalization has reshaped consumer decision-making processes, purchasing patterns, and brand engagement. The findings suggest that while online marketing provides enhanced personalization, cost efficiency, and measurable outcomes, offline marketing continues to contribute to brand credibility and regional outreach. The study concludes that an integrated marketing communication strategy combining both approaches is essential for sustainable business growth in the contemporary digital economy.