Data Labeling: The process of categorizing or tagging data with labels that provide informative context or meaning, facilitating proper handling and protection according to the specified labels.

Data Lake: A centralized repository that allows you to store all your structured and unstructured data at any scale. You can store your data as-is without having to first structure the data and run different types of analytics—from dashboards and visualizations to big data processing, real-time analytics, and machine learning to guide better decisions. Data lakes are typically implemented using a flat architecture where data is tagged with metadata and unique identifiers and can be efficiently queried and analyzed.

Data Leak: An incident where sensitive, protected, or confidential data is unintentionally exposed, transmitted, or made accessible to unauthorized individuals. This could be the result of various actions, such as poor security configurations, vulnerabilities in software, or human error, and can lead to significant reputational and financial damage.

Data Leakage: An event where information, either intentionally or accidentally, is moved outside of an organization's security boundaries, possibly falling into the wrong hands. Data leakage could occur through various channels, such as email attachments, cloud storage, physical devices, or even through employee misconduct.

Data Lifecycle: The sequence of stages that a particular unit of data goes through from its initial generation or capture to its eventual archival and retirement or deletion. This lifecycle typically includes stages such as creation, processing, storage, usage, sharing, archiving, and disposal, with each stage necessitating specific handling and security measures.

Data Link Layer: The second layer of the OSI model handles the transfer of data between adjacent network nodes within a wide area network (WAN) or between nodes on the same local area network (LAN) segment. It encompasses the protocols and methods used to ensure an error-free transmission through physical addressing, data framing, network topology, error detection, and handling retransmissions. The Data Link Layer is subdivided into two sublayers - the Logical Link Control (LLC) layer and the Media Access Control (MAC) layer.