The convergence of ubiquitous connectivity, large-scale data generation, and rapid advancements in machine learning is transforming the field of cybersecurity. The widespread adoption of interconnected systems including Internet of Things devices, mobile platforms, and cloud infrastructures has introduced new attack surfaces and significantly increased the complexity of securing digital environments. Concurrently, these technologies have enabled the development of intelligent, data-driven defense strategies. Achieving effective protection in these settings requires not only applying machine learning to detect and prevent threats but also recognizing that such models can themselves become targets of adversarial manipulation. This survey presents a comprehensive analysis of recent progress at the intersection of machine learning and cybersecurity. It explores defensive applications such as malware detection, network traffic classification, and anomaly detection, as well as offensive strategies including adversarial evasion, poisoning, and backdoor attacks. Particular attention is paid to adversarial machine learning, highlighting the increasing sophistication of attacks that exploit model vulnerabilities and the corresponding evolution of defense mechanisms. Beyond synthesizing current research, the survey also identifies key open challenges and emerging research directions. This survey provides a comprehensive and accessible reference for researchers and practitioners aiming to understand and advance the secure application of machine learning across diverse cybersecurity domains.