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In the first reported data breach, 250,000 social security numbers collected by the State of California were stolen from a data center.

Data breach

Intentional or unintentional release of secure information

A data breach, also known as data leakage, is "the unauthorized exposure, disclosure, or loss of personal information".
Source: Wikipedia (CC BY-SA)

Social Security number

Nine-digit number issued to U.S. citizens and permanent residents

In the United States, a Social Security number (SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2). The number is issued to an…
Source: Wikipedia (CC BY-SA)

California

U.S. state

California is a state in the Western United States that lies on the Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares an international border with the Mexican state of Baja California to the south. With almost 40 million residents across…
Source: Wikipedia (CC BY-SA)