Final answer:
Security Information and Event Management (SIEM) is the tool used for centralizing security management and is designed to provide a real-time overview of an organization's information security.
Step-by-step explanation:
The tool used for centralizing security management, allowing administrators to manage all their security-related hardware and software through a single device or interface, is Security Information and Event Management (SIEM).
SIEM solutions collect and aggregate log data generated throughout the organization's technology infrastructure, from host systems and applications to network and security devices such as firewalls and antivirus filters. Then, they identify and categorize incidents and events, as well as analyze them. The goal of a SIEM is to provide a real-time overview of an organization's information security, help detect activities that might indicate a security threat, and enable swift response to those threats.