The realm of flexible electronics has experienced an exponential expansion over the last 20 years, with a wide range of applications. The implementation of flexible electronics is progressively escalating across multiple domains that reap the rewards of their diminutive dimensions, lightweight structure, and advantageous dielectric attributes. This chapter comprehensively covers the introduction and fundamentals of flexible electronics and types and manufacture techniques for flexible electronics. This chapter focuses on novel polymeric materials, nanomaterials, polymer hybrids, and polymer-sandwich nanocomposites used in flexible electronics. It also discusses topics including electrospinning, three-dimensional (3D) printing techniques, and roll-to-roll (R2R) processing for flexible electronics. The chapter highlights the role of electrospun nanofibrous composites in energy storage devices and concludes with recent trends, advancement, and applications of flexible electronics.