This technical note analyzes the emerging market for humanoid robots, which are general-purpose machines engineered to function in human-centric environments. It reviews the technological architecture of humanoids, including actuation, power systems, perception, computing, and autonomy, and outlines the expanding ecosystem of manufacturers, component suppliers, artificial intelligence firms, and system integrators. The note identifies major commercial applications in logistics, manufacturing, health care, retail, hospitality, household assistance, education, and defense. It contrasts deployment-first strategies with form-factor-first approaches. While market forecasts indicate rapid growth driven by advances in artificial intelligence, decreasing component costs, and labor shortages, widespread adoption is still limited by technical, economic, safety, regulatory, and ethical challenges. Present-day humanoids exhibit constraints in battery life, locomotion, manipulation, perception, reliability, and cost. Furthermore, the lack of harmonized standards complicates large-scale deployment.