This chapter synthesizes key theories and frameworks that explain the adoption, use, and benefits of Information and Communication Technology (ICT) in the context of healthy aging. It begins by examining foundational models of technology acceptance, such as the Technology Acceptance Model (TAM), Unified Theory of Acceptance and Use of Technology (UTAUT), and the Senior Technology Acceptance Model (STAM), to illuminate factors influencing older adults’ digital engagement. It then explores theories addressing the motivations and purposes of ICT use, including the Uses and Gratifications Theory and the Theory of Planned Behavior. Barriers to adoption are analyzed through the Digital Divide Theory, while additional frameworks, such as the Activity Theory of Aging, Self-Efficacy Theory, and the Socioemotional Selectivity Theory, highlight how ICT supports social participation, autonomy, and emotional well-being in later life. Collectively, these frameworks underscore ICT’s role in enhancing social connectivity, cognitive health, and aging-in-place. The chapter concludes by identifying research gaps and offering directions for future studies and policy interventions aimed at fostering digital inclusion for older adults.