Two dimensional systems, by the virtue of their unique material properties and excellent electrostatic integrity, provide immense opportunities not only to explore fundamental physics but also to solve critical technological problems. Graphene, Phosphorene, h-BN, MoS2, WSe2 and many others belong to this class of material which we are thoroughly exploring. In my talk I will first demonstrate how "Contact Engineering" has been employed to unravel and understand the true electrical performance of the 2D materials. Then I will discuss the ease of "Band Structure Engineering" in the 2D materials for implementation into innovative device ideas. And, finally I will focus on the "Integration and Application" of 2D materials for flexible and transparent electronics. I will also furnish a brief overview of optoelectronic devices based on 2D materials and large area synthesis of both homo and heterostructures of 2D materials. The fact that this class of materials contains metals, semiconductors, insulators and even superconductors at cryogenic temperature makes them extremely appealing across all scientific and engineering disciplines.