Privacy preservation is a research area that focuses on developing techniques and methods to protect individuals' personal information and data from unauthorized access or disclosure. This can include developing encryption methods, anonymization techniques, and access control mechanisms to ensure that individuals' privacy is maintained in various data processing and communication systems. The goal of privacy preservation research is to strike a balance between the benefits of utilizing data for analysis and decision-making while also protecting the privacy rights of individuals. This research area is particularly important in the digital age where vast amounts of personal data are collected and analyzed by organizations and governments.