Non-destructive testing (NDT) has emerged as a critical tool in assessing the quality and integrity of concrete structures. This paper provides a comprehensive overview of the tools, techniques, and current trends in the field of NDT for concrete. We delve into the innovative methods that enable engineers and researchers to evaluate concrete health without causing structural harm. The paper explores the principles of various NDT techniques, including ultrasonic testing, radar, electrical resistivity, and more, highlighting their applications and advantages. Furthermore, we discuss the evolving trends in NDT, such as the integration of digital technologies and artificial intelligence. By shedding light on these advancements, this paper contributes to a deeper understanding of NDT's role in ensuring the longevity and safety of concrete structures.