Data Users: Individuals or entities that access, analyze, or utilize data as part of their business processes, research activities, or decision-making tasks. Data users can range from business analysts and data scientists to end-users inputting and retrieving data from an application. They are typically subject to data governance policies and responsible for adhering to data protection laws and best practices.

Data Warehousing: A system used for reporting and data analysis, widely considered as a core component of business intelligence. It involves the consolidation of data from various sources into one comprehensive database. Data warehousing enhances the ability to extract useful insights from the data, as it provides an organized, unified view of the data collected from various parts of an organization.

Decentralization: The distribution of functions, powers, people, or things away from a central authority. In technology, this often refers to distributed networks, like blockchain and peer-to-peer systems, where control is spread across all nodes, enhancing resilience and reducing single points of failure. It can also describe organizational structures where decision-making is shared to improve flexibility and responsiveness.

Decertification: The process of revoking or withdrawing the certification of a product, service, or professional qualification, often due to non-compliance with set standards or regulations or in the aftermath of discovering new vulnerabilities or defects that significantly impact performance or security. In the IT field, decertification can occur with security products, software, and professionals if they no longer meet industry or regulatory requirements.

Decipher: The process of converting encrypted information or data into a readable and understandable form, typically requiring a specific key or password. This process is central to ensuring confidentiality and secure access to sensitive or private data.

Decision Support Systems (DSS): The interactive software applications used to help individuals or organizations make decisions by providing relevant data, models, or analytical tools. These systems are employed across various sectors and can help improve efficiency and accuracy in decision-making, ensuring the best possible outcomes based on the information available.