The Sitecore Habitat demos are built on the Helix principles, which is a set of principles and conventions focused on.
Making the Sitecore solution manageable and simple - even as it grows and matures.
Assuring the business that changes and additions can be made with smaller investments and without disruptions.
Providing a quick and manageable way of extending solutions and reusing features across sites and even across solutions
The conventions are based on a number of well-founded and industry-standard principles such as