Major challenges to agricultural development in developing countries have been the low level of agricultural information exchange among the different stakeholders in the agricultural sector. Fortunately, the recently radical penetration of information and communication technologies (ICTs) tools in developing countries offers a great opportunity for overcoming information problems. Use information and communication technology (ICT) enables to facilitate rapid, efficient and cost effective knowledge management. The experiences of most countries indicate that the use of ICT based extension, marketing and banking which facilitates the flow of data and information, that has tremendously enhanced the knowledge management, financial inclusion and market efficiency. This paper has intended to review, the subscription and broadband level of ICTs in least developing countries and to review the role of ICTs for rural and agricultural development in least developing countries. To review this paper all recently(conducted before 2010) ICT for agriculture (ICT 4Ag) related journals, reports, conferences, working papers and other documents studied for developing countries had used.