India's vaccination drive against Covid-19, pegged as the largest adult immunisation drive ever, is underpinned by the CoWIN application. This software allows recipients, healthcare workers, and the government to keep track of various aspects like the vaccine used, the date of administration, and name of the administrator, the next due date, and the certificate of vaccination. Now, India is offering the source code of CoWIN free of cost to any country which is interested. And there are quite a few - over 50 at last count. Watch the full video to know why so many nations are pinning their hopes on this Indian app to boost their vaccination drives.