Entrepreneurship, startups, and innovation have emerged as critical drivers of economic development, technological advancement, and social transformation in the modern global economy. In recent decades, entrepreneurial ecosystems have expanded rapidly due to globalization, digitalization, and increasing access to technology and financial resources. Entrepreneurs play a central role in identifying market opportunities, introducing innovative products and services, generating employment, and contributing to national competitiveness. Startups, particularly technology-based ventures, have become powerful engines of disruption and growth by transforming traditional industries and creating new business models. Innovation acts as the foundation of entrepreneurial success, enabling organizations to respond effectively to changing consumer demands, market uncertainties, and technological shifts. This chapter examines the interrelationship between entrepreneurship, startups, and innovation and their significance in economic and social progress. It discusses the concepts, characteristics, and types of entrepreneurship, the development and growth of startups, and the role of innovation in sustaining competitive advantage. The chapter also explores the entrepreneurial ecosystem, including government support, venture capital, incubators, accelerators, and educational institutions. Furthermore, it highlights the opportunities and challenges faced by startups in contemporary markets, including financial constraints, technological disruption, competition, regulatory barriers, and sustainability concerns. Real-world examples and case studies demonstrate how innovative startups have transformed industries and societies. The chapter concludes by emphasizing the importance of fostering innovation-driven entrepreneurship through supportive policies, skill development, research collaboration, and digital transformation. By understanding the dynamic relationship between entrepreneurship, startups, and innovation, policymakers, educators, researchers, and aspiring entrepreneurs can contribute more effectively to sustainable economic growth and inclusive development.