In the competitive landscape of e-commerce, mastering the intricacies of online advertising is essential for sellers looking to maximize their presence and profitability. Amazon, being a retail giant, offers a powerful advertising platform known as Amazon Advertising. Among the key metrics that sellers need to understand and optimize is the Advertising Cost of Sale (ACOS). In this article, we will delve into the intricacies of Amazon ACOS, exploring its definition, significance, and strategies to achieve optimal results.