Let us talk about DFT in VLSI that is, Scan Design for Testing or Design for Testability and it is not Discrete Fourier Transform from Mathematics. Here the main purpose of the DFT Engineers in VLSI is to incorporate some extra logic structure in the design to make the testing easy, cost effective and efficient design for manufacturing and assembly (DFMA). Mainly here we are going to add some DFT testability features to design of a hardware product. After going through this post completely we must be able to answer all the following questions and the same these questions can be asked in VLSI interview. What is DFT in VLSI? Why DFT is used in VLSI? Why DFT is required? What is DFT architecture? What is