Critical infrastructure plays an active and dynamic part in supporting the seamless progression and assimilation of modern society. The performance, safety, reliability, continuous operation, maintenance, and protection of critical infrastructure are among the national priorities for countries around the world. Critical infrastructure (CI) offers essential services that underpin society and serve as the backbone of any nation's economy, health, and security. The power used in homes and industries, potable water, transportation, and communication systems is a part of critical infrastructure. The critical infrastructure sectors comprise assets, networks, and systems, whether physical or virtual. The physical protection of critical infrastructure can prevent the commission of high-impact terrorist attacks and avoid the cascading effects that are frequently associated with such attacks. INTERPOL has observed an increase of 200%, in the number of profiles of foreign terrorist fighters, between January 2017 and April 2018. Further, defense bases and facilities are widely supported by a variety of critical infrastructure and operational technology right from power generation and utilities to building automation and safety systems. Destruction or incapacitation of these bases can have a debilitating effect on the national economic security, safety, or any combination thereof such as loss of power, exposure of confidential information, interruptions to operations, and threats to the safety of personnel.

人力资源服务产业主要包括人力资源外包、中高端人才访寻、灵活用工、在线招聘、人力资源综合咨询、人力资源软件等。其中，人服软件是人力资源服务产业链的上游产业，典型业态为在线招聘；人力资源外包是人力资源服务产业链的中游产业，主要包括招聘流程外包、人事代理及传统派遣、薪酬福利外包等，对中高端人才和临时工的需求分别催生了中高端人才访寻（即猎头）和灵活用工产业；人力资源综合咨询是人力资源服务产业链的下游产业，主要包括人力资源咨询、人才测评与评鉴、管理培训与人才发展等。