Description: The functionality gap refers to the discrepancy between the features and capabilities that a system, such as a cloud service, offers and the expectations that users have about that system. This gap can arise for various reasons, such as a lack of communication between developers and end-users, the rapid evolution of market needs, or a service’s inability to adapt to changing demands. The functionality gap can significantly impact user satisfaction, as if a service does not meet expectations, users may feel frustrated and seek alternatives. Additionally, this gap can affect the adoption of cloud technologies, as organizations may hesitate to invest in solutions that do not seem aligned with their needs. Identifying and closing this gap is crucial for service providers, as it allows them to improve their offerings, increase customer loyalty, and ultimately secure their position in a highly competitive market. In summary, the functionality gap is a key concept in evaluating cloud services, as it reflects the alignment between what is offered and what is expected, and its effective management is essential for the success of any technological solution.