CD IELTS (Computer Delivered IELTS) is delivered through a computer where you have to mark your answers on the computer screen and writing assignments are typed on the computer. In the paper test, you have to mark the answers in the answer sheets. In case, your handwriting is less legible, take CD IELTS. Also, CD IELTS result comes in 6 days as compared to 13 days for the conventional test.