Java Security refers to the set of mechanisms and practices that protect Java applications from threats and vulnerabilities. It includes features like the Java Security Manager, which controls access to system resources, and the Java Cryptography Architecture (JCA), which provides tools for secure data encryption and decryption. These features help ensure that Java applications run safely and securely. Another important aspect of Java Security is the use of digital signatures and certificates. These tools verify the authenticity of code and ensure that it has not been tampered with. By implementing these security measures, developers can create robust applications that safeguard user data and maintain trust in the software.