Digital marketing is a way of promoting the thing globally with less per head expenses. As we know promotion for every thing is very necessary to get the benefit from the customer. Until and unless they are not aware of the product they will not buy it. So to expand our business globally we required a medium to serve us and then Digital marketing comes into picture. In other words we can say it is a Delivery channel for organizations like banks. Where they can describe there product and services with customer through different techniques of  digital marketing  that are E-mail and news, mobile apps, Social media and etc. In the end I would conclude marketing through Digital Marketing is adding a extra perk to your business. It is just a gist about the DM you can try and fill it.