Homogeneous nucleation refers to the process where a new phase or new structure forms uniformly throughout the parent phase. In the context of nanotechnology, homogeneous nucleation is a fundamental concept that describes the initial stage of phase transition, where atoms or molecules self-organize into a new cluster or particle without any preferential site for nucleation. This is in contrast to heterogeneous nucleation, where nucleation occurs at specific sites such as impurities, surfaces, or interfaces.