@jest/types provides TypeScript type definitions used extensively within the Jest testing framework. It offers a standardized set of interfaces and types for configuring Jest, defining test results, working with matchers, and more. This package enhances type safety and developer experience when extending or customizing Jest, ensuring consistency across various components of the framework and facilitating autocompletion and error detection within IDEs. Using @jest/types is crucial for building robust and well-typed Jest integrations.