Design-for-testability (DFT) is a design approach that makes it easier to test and verify the functionality of a product, especially in electronics. By incorporating specific features during the design phase, engineers can ensure that the product can be efficiently tested for defects and performance issues, reducing the time and cost of testing. DFT techniques include adding test points, built-in self-test (BIST) capabilities, and simplifying circuit layouts. These methods help identify problems early in the development process, leading to higher quality products and more reliable performance in the final product.