As well as IELTS, CD-IELTS means for Computer Delivered – International English Language Testing System. Although both the exams are the same, the medium of delivery is different as IELTS is written on paper and CD-IELTS is conducted using computer.
Since, CD-IELTS exam use computer for its execution, students must be proficient in using computers. For instance, they must be able to type fast and accurately for the writing section of CD-IELTS. Furthermore, they should be comfortable reading passages and questions on the computer screen and marking answers to them.