Digital marketing is promoting brands or creating awareness using online channels to engage with audiences and motivate them to take desired actions. It has objectives like reaching the right audience, engagement, motivating actions, efficient spending, and ROI. Digital marketing mediums include search engines, websites, social media, mobile apps, email, and inbound marketing. It is a more effective way to reach global audiences compared to traditional marketing and offers guaranteed ROI. Career opportunities in digital marketing include roles as a digital marketer, entrepreneur, professional job, freelancer, or online earnings.