The rapid rise in India’s urban population is mainly in search of employment and education. Due to this rapid urbanization, the government is suppressed to concentrate on solutions for certain problems like overcrowding, pollution, resource constraints, needs for the development of infrastructure and restoration of ageing Infrastructure. As to meet these demand and problems, India has stepped into developing and constructing major cities as Smart cities in 2015 as ‘National Smart Cities Mission’ under Union Ministry of Urban Development. It is an initiative to make these cities friendly and sustainable to citizens as well as to nature. Some major barriers in developing a smart city in India are financing or allocation of budget, availability of resources, planning with most advanced techniques and making people used to it, rehabilitation and resettlement of huge population. Indian cities are already well-developed cities when compared to others, but through proper planning and implementation, it can also be made into Best smart cities in the world. This paper focuses on the Idea of Smart City, concept of smart city mission of India, its challenges and implementation. And also about the Smart city solutions and initiatives in some of the major smart cities of the world.