Seamlessly merging electronics with human is of imminent importance in addressing grand societal challenges in health and joy of living. However, the main challenge lies in the huge mechanical mismatch between the current form of rigid electronics and the soft curvy nature of biology. Here, I will present a new form of electronics, namely “rubbery electronics and bioelectronics”, with skin-like softness and stretchability, which is constructed all based upon elastic rubbery electronic materials. These rubbery electronic materials are structured in the format of composites, which can be scalably manufactured from common and commercial available materials without dedicated and complicated synthesis. Specifically, we build nanofibril organic semiconductors percolated in the elastomeric polymer matrix in a composite format for the rubbery semiconductors. I will present fully rubber format devices, including transistors and sensors, logic gates, active matrices, elastic sensory skin systems, and biointegrated devices, etc.