ITSM refers to the processes, policies, and practices that organizations use to design, deliver, manage, and improve IT services. It focuses on aligning IT services with the needs of the business and ensuring efficient and effective service delivery.

A firewall is a network security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its primary role is to create a barrier between a trusted internal network and untrusted external networks, such as the internet.

Wireless technology enables data transmission between devices without the use of physical cables. It includes Wi-Fi, Bluetooth, and cellular networks, providing mobility and flexibility in communication and data access.

A wired network uses physical cables (e.g., Ethernet) to connect devices and systems for data transmission. It is known for offering stable, high-speed connections and is typically used for local area networks (LANs) in businesses and data centers.