In simple terms, digital marketing is instead of marketing or publishing an advertisement in a newspaper or magazine we put the advertisement in a website which is most visited.
This is very vast subject but I will try to cover what I had researched and understood by searching the web for almost 60 days.
So it goes like this you are good at particular topic says bikes, then you go ahead and write something about bikes which becomes a blog on the internet and you use digital marketing to promote your blog.Please check more about blogging in my post professional blogging if you are new to blogging.
It took me two days work and 40$ (to purchase the domain including maintenance for one full year) to get this website buildmyITcareer.com up and running.
Still confused??, please check out the below links for more insight:
A link to understand the basics of digital marketing:
Video courtesy from http://www.webtrainings.in/
Though I was a computer science post graduate and worked in IT sector (which includes companies like Tech Mahindra Limited, TCS and CGI) for close to 9 years, digital marketing was something new to me when I was building this website and at times I would lose hope but my inspiration came from websites like DigitalDeepak.com