Low-dimensional photonics is the research field investigating the generation, manipulation, and detection of light within materials or structures exhibiting quantum confinement in one or more spatial dimensions, focusing on phenomena occurring at the nanoscale. This field explores how reduced dimensionality and associated quantum effects modify optical properties, light-matter interactions, and energy transfer mechanisms compared to bulk materials. Key characteristics include dimensionally-dependent electronic band structures, enhanced exciton binding energies, and tailored density of states, which lead to novel optical functionalities. Its significance lies in enabling the miniaturization of photonic devices, developing highly efficient light sources and detectors, and creating integrated optical circuits for applications spanning quantum technologies, communication, sensing, and energy harvesting.