What are the key differences between digital marketing and traditional marketing, and how can businesses leverage both effectively?

Traditional marketing including bill boards,Tv commercials, Ads in news paper is one way communication you can display your advertisement in wide range of audiance it is expensive  

Digital Marketing include social media, blogs, content may be precisely targeted and allows 2 way communication and it is more effective and less expensive 

I think the key difference is staying at customer's top of mind. Through digital it is more easier to stay on customer's top of mind than traditional. Digital marketing also allows the customer to engage with brands easily compared to traditional. For a business, there has to be a balanced approach to utilize both sort of marketing based on the buyer persona.