Because it is more effective and more consumer focused. Some people have reading habits, some watch television a lot, some listen to radio more often, etc . So your promotion tactics has to be balanced, otherwise, business might lose its target customers. Businesses advertise in magazines for people who read more, and advertise electronically for Television and radio lovers.
The main reason behind the promotion of a business is getting more customers, more lead so that a business can be converted into a profitable business.
Digital marketing plays an important role in promoting the business, as the number of internet users are increasing day by day.
With the help of digital marketing we can easily target and track our audience.
If you want to get more lead for your business promote it on Facebook, Facebook has billion of active users.
To know how to promote business on Facebook, read the guide- Promote business on Facebook