Electronics that can seamlessly integrate with human body could have significant impact in medical diagnostic, therapeutics. However, seamless integration is a grand challenge because of the distinct nature between electronics and human body. Traditional electronics, rigid and planar, face inherent mismatches with the soft, deformable nature of the human body. This presentation will introduce our solution to the challenge. Our approach, termed "rubbery electronics," relies on the use of elastic, rubbery materials for semiconductors, conductors, and dielectrics. These materials exhibit tissue-like softness and mechanical stretchability, enabling seamless integration with soft, deformable tissues and organs. The presentation will highlight the development of rubbery materials, particularly the nanocomposite semiconductors engineered to balance carrier mobility and mechanical stretchability – as the foundation for rubbery electronics. Building on these materials, this presentation will also showcase our advances in electronics, sensors, and functional systems and their applications in healthcare, robotics, and human-machine interfaces. As a platform technology, rubbery electronics not only overcome longstanding challenges in biointegration but also open broad opportunities for innovation, promising significant impact across diverse scientific and technological frontiers.