Traditional curing methods for concrete often lead to premature cracking and diminished strength. Internal curing (IC) concrete offers a solution by integrating pre-saturated lightweight aggregates, superabsorbent polymers, and polyethylene glycol, which release water during cement hydration. This sustains hydration and minimizes the need for external curing, particularly advantageous in challenging environments and high-rise structures. This chapter delves into the underlying principles and benefits of IC, such as significantly reducing shrinkage cracking by up to 30% and enhancing durability by approximately 35%. It covers critical aspects of material selection and mix design, as well as real-world applications in pavements, bridges, and high-performance concrete. Through detailed case studies, this chapter illustrates the improved mechanical properties and longevity of internally cured concrete. Additionally, it discusses the limitations and considerations for optimizing mix designs, underscoring the transformative potential of IC technology in modern construction practices. Ultimately, internally cured concrete emerges as a sustainable and cost-effective method to enhance the quality and lifespan of infrastructure projects.