Memory Tagging is a cybersecurity technique where unique identifiers, or 'tags,' are assigned to specific blocks of computer memory. These tags help the system track how memory is used and detect improper or unauthorized access, such as buffer overflows or use-after-free errors. By comparing the tags during memory operations, the system can quickly spot and block suspicious activity, reducing the risk of security vulnerabilities and software bugs. Memory tagging is especially useful for preventing common types of attacks that exploit memory management errors in software.