The NVD is the U.S. government repository of standards-based vulnerability management data managed by the National Institute of Standards and Technology. The NVD includes databases of security checklist references, security-related software flaws, misconfigurations, product names, and impact metrics.
The CVE (Common Vulnerabilities and Exposures) list was created by MITRE in 1999. The CVE reference system assigns each publicly disclosed security vulnerability a CVE identification number. Those IDs are then provided to researchers, vulnerability disclosers, and information technology vendors.
Though the CVE list and the NVD are separate, they’re interconnected. That is, the NVD is built on and synchronized with the CVE list, so any updates to CVE should eventually appear in the NVD.