AppleCare is Apple’s name for extended warranty and technical support plans for its devices. In general, Apple hardware has included a one-year limited warranty and 90 days of technical support by telephone. For an additional cost, AppleCare extended warranty coverage and technical support extends the length and expands the coverage.
When introduced, AppleCare included this packaged CD containing hardware tests that might be used to help diagnose a problem during phone support. This version is from 2002 and matched the design of other boxed software Apple sold at the time.
Source: Wikipedia