So i felt like sharing the web portals which just revolutionized whole e-commerce business in India. I selected 5 such portals along with their business revenue source via Internet.
Started as online bookstore now sells almost everything. In short i would say its AMAZON of India. I am a big fan of them. One new thing which they bought to Indian customers was “cash on Delivery ”
One of the web portal catering needs of Indians looking for employment. A job portal in simple terms.
One of the very first web portal came in existence to help in marriage match making(matrimony)
I am a regular user of this site. The site provides online reservation of bus tickets for almost all major cities. They already have over million tickets booking done. 
One of the first web portal which launched with aim of providing great flight ticketing experience.
Lastly almost all of them are using cloud 