The study examined the Effect of advertisement on the Rational of Small and Medium Scale Business (SMEs) in Benin Metropolis. The research aimed to investigate the advertising strategies employed by SMEs, assess the effectiveness of different advertising channels, and determine the impact of advertising on business visibility and brand recognition. The study employed a descriptive survey design with a target population of selected SME owners in Benin Metropolis. A total of 100 SME owners were purposively sampled, and data were collected using a structured questionnaire divided into demographic and research-specific sections. Data were analyzed using frequency tables, percentages, and Chi-Square (χ²) statistical tests to examine the relationships between advertising practices and SME Rational. Findings revealed that advertising, as currently implemented by SMEs in Benin Metropolis, had no statistically significant effect on business visibility and brand recognition. The study identified factors such as inconsistent advertising practices, poor targeting of messages, limited digital marketing knowledge, and lack of access to analytical tools as major constraints to effective advertising. Based on the findings, the study recommends capacity building in digital marketing and advertising, access to affordable professional advertising services, adoption of Integrated Marketing Communication (IMC) strategies, government and institutional support, and the use of data-driven approaches to improve advertising outcomes. The study concludes that while advertising currently shows limited impact, strategically planned and professionally executed advertising has the potential to significantly enhance SME Rational in Benin Metropolis.