Cdr

CDR is an acronym that can refer to several concepts across different fields, and its meaning is usually determined by the context in which it is used.

In telecommunications, a call detail record is a data log generated by a telephone exchange or voice over IP system that records metadata about a call or session. Typical contents include timestamps, duration, origin and destination numbers, call type, and charging information. CDRs are used for billing, network management, fraud detection, and lawful intercept requests.

In computing and data storage, Compact Disc Recordable is an optical disc format that can be written to once using a CD-R drive. Introduced in the 1990s, CD-Rs are used for data archives, backups, and audio recordings. Compatibility with playback devices varies, and some early or low-end players may have limited support.

In healthcare informatics, a clinical data repository is a centralized database that aggregates patient data from multiple sources to provide a unified view for care coordination, reporting, and analytics. These repositories often serve as a foundation for clinical decision support systems and integration with electronic health records and data warehouses.

In immunology, the complementarity-determining regions are the three hypervariable regions of the antibody or T-cell receptor variable domains that form the antigen-binding site. CDR1, CDR2, and CDR3 determine the specificity and affinity of binding, and they vary among different immune receptors, playing a critical role in immune recognition.