This chapter examines the transformative evolution from Second-Party Logistics to Third-Party Logistics (3PL), highlighting how 3PL providers have become the cornerstone of modern supply chain management. Moving beyond traditional transportation and warehousing services, 3PL operations integrate multiple logistics functions into cohesive solutions that fundamentally reshape organizational supply chain strategies. The chapter provides a comprehensive analysis of 3PL characteristics, exploring their strategic partnership model, technology integration capabilities, and industry-specific applications across retail, healthcare, manufacturing, and other sectors. It addresses critical implementation considerations, including risk management approaches, global operational variations, performance measurement frameworks, and cost-benefit analyses. Special attention is given to change management strategies, structured partner selection methodologies, and 3PL solutions tailored for small and medium businesses. The chapter concludes with emerging trends shaping the future of 3PL services, emphasizing how organizations can leverage these partnerships to transform their supply chains from cost centers into engines of competitive advantage in an increasingly complex global marketplace while also preparing for future progression toward 4PL models.