ISO/IEC 20000 is an industry standard for quality in IT service management processes. These service management processes deliver the best results that meet user's business needs in agreed-upon levels of resources, ensuring professional, cost-effective services with a understood and manageable level of risk.
ISO/IEC 20000 originated as a replacement for the British standard BS 15000. It consists of two parts:

1. The first part presents the specifications and requirements for IT Service Management. Organizations can be certified according to these specifications which represent the minimum requirements an organization should meet.
2. The second part provides a code of practice for service management, describing best practices for IT service processes within the mentioned specifications.

ISO 20000-1:2018:

•  Provides a general basis for service improvement.
• Offers guidance to assessors and helps service providers plan improvements.
• Recommends that service providers adopt a common terminology and more consistent approach to service management.

Benefits and advantages of implementing ISO 20000-1:2018:

•  Aligns business and IT service strategies.
• Provides a framework for existing service improvement projects.
• Promotes benchmarking against best practices.
• Enhances existing services by making comparison a requirement.
• Drives progressive culture through awareness and accountability.
• Supports internal changes for service providers and staff by creating internal operational processes.
• Reduces risks and costs for service recipients.
• Imposes significant organizational changes through the adoption of existing standards.
• Improves reputation and perception.
• Shifts focus from reactive to proactive processes.
• Enhances communication between different departments by clarifying responsibilities and objectives.
• Creates a stable framework for resource management and automated service control.

In summary, ISO/IEC 20000 is a standard that provides guidelines and best practices for managing IT services effectively and improving the relationship between IT and the business it supports.