Addresses light-matter interactions that lead to material properties not accessible in equilibrium. Phases and ordered states accessed via light-induced perturbations to energy landscapes, topological material behavior enabled by optical excitation, and formation of exotic quantum phases are explored to provide new understanding of and control over optically responsive materials. Research advances in this IRG are expected to lead to new understanding of material behavior accessible and controllable using temporally structured light, with potential applications in a broad range of technologies for communications and information processing.