Digital marketing allows companies to effectively reach and engage target audiences through various online channels. It provides wider reach by breaking down geographical barriers, targeted advertising through data analysis, and cost effectiveness compared to traditional methods. Digital marketing also offers measurable results through analytics, personalization of messages based on customer preferences, and the ability to establish an online brand presence. It enables real-time customer engagement and flexibility to quickly adapt marketing strategies. Overall, digital marketing is useful for businesses today due to these advantages of audience reach, targeting, measurable performance, and strategic agility.