ISO 20000 is that the global standard for IT Service Management (ITSM), published by ISO (the world organization for Standardization), and ICE (the International Electoral Commission). To become a worldwide standard, ISO 20000 had to be prescribed by a majority of member countries, which suggests it's accepted by a majority of countries worldwide.
The standard describes a group of management processes designed to assist you deliver more effective IT services (both to those within your business and to your customers). ISO 20000 gives you the methodology and also the framework to assist you manage your ITSM while allowing you to prove your company follows best practices. With the wants of the standard, you'll achieve best practices, helping to enhance your delivery of IT services. And this standard is applicable to any company size and any industry.
The standard includes mainly two parts which allow service providers to classify methods to develop the quality of the services they deliver to their clients, both internally and externally whereby,
ISO 20000-1(Part-1) stipulates the requirements for developing and implementing a service management system.