Why do the service management in IT industry can be regarded as a professional solution?

Because it is either related to the technical hardware infrastructure or the busines process improvement software solutions through design, implementation, & effective use.

ITSM (IT service management) is a professional solution to the classical needs and requirements rearding IT service delivery and support.  ITSM follows industry best practices and delivers solutions and answers to the traditional issues and challenges associated with IT service management to meet service level objectives and targets as well as to take into account all associated disciplines of problem management, change management, configuration management, capacity management, operations management, performance management, helpdesk / service center ....  

ITSM is process-focused and has ties and common interests with process improvement frameworks and methodologies (e.g., TQM, Six Sigma, business process management, CMMI). The discipline is not concerned with the details of how to use a particular vendor's product, or necessarily with the technical details of the systems under management. Instead, it focuses upon providing a framework to structure IT-related activities and the interactions of IT technical personnel with business customers and users.

Becouse it's very imortant IT service for any secter or busniess so if you  need the work accourat you need 

 professional solution ..

Because this is the professional way of working. Every professional need assistance from a professional.

I agreed with point of view expressed here by Mr. Thiab

ITIL is a effective process of handling IT in a corporate or a company. If is a tested process for a sucessfull management. The key benifits of ITIL are 

• Improved Customer Service perception and satisfaction
• Increased accessibility through a single point of contact, communication, and information
• Better-quality and quicker turnaround of customer requests
• Improved teamwork and communication
• Enhanced focus and a proactive approach to Service provision
• A reduced negative business impact
• Better managed infrastructure and control
• Improved usage of IT support resources and increased productivity of business personnel
• More meaningful management information to support decisions

I agree with the reply of Mohammed Thiab.

 I do agree with both Mr. Mohammed thiab & Mr. Mohammed tohamy too