An IT service catalog is a list of information technology resources and offerings available from the IT service provider within an organization. This catalog is intended to help the IT service provider efficiently and effectively manage and meet end-user expectations. It serves as a bridge between the IT department and the business users, providing a transparent view of what IT services are available and how they can be accessed.

The IT service catalog differs from the IT service portfolio. The IT service catalog is a list of technology services available to users. The IT service portfolio is a complete list of all IT services and products, including those in development and those that have been retired, in addition to those currently in use.

The catalog focuses on current, active services that users can request, making it a practical tool for daily operations.