Infrastructure resilience is the capacity of critical infrastructure systems, such as energy grids, transportation networks, and communication systems, to anticipate, withstand, adapt to, and rapidly recover from disruptive events, whether natural hazards, technological failures, or malicious attacks. As an academic concept and research field, it investigates the systemic properties and strategies that enable these complex socio-technical systems to maintain essential functions during and after stress, encompassing aspects like robustness, redundancy, flexibility, and resourcefulness. Its significance lies in ensuring continuity of vital services, mitigating socio-economic impacts, and enhancing overall societal security and stability in an era of increasing uncertainties and interconnected risks.