IT service management involves outsourcing your IT services to a third-party provider to manage your IT infrastructure, systems, and operations. This approach focuses on improving productivity, reliability and security, allowing businesses to focus on core activities.

Key aspects of managing IT services include:

1. IT Infrastructure Management: Covers hardware, network monitoring, server management, and disaster recovery.

2. Help Desk Support: Provides technical inquiries and troubleshooting.

3. Cyber security services: Includes threat management, firewall management and data protection.

4. Cloud Services: Includes cloud infrastructure management, migration and optimization.

5. Data Backup: Ensures data recovery and backup in case of system failure.

IT consulting helps businesses with strategic IT planning and technology investments.

The top IT consulting firms in the US offering these services are Accenture, IBM and Cognizant, known for their robust solutions in IT infrastructure, cloud computing and cyber security.