The TOEFL iBT test is delivered through the internet. The test is administered online at testing sites across the world. It monitors the reading, writing, speaking and listening skills of the candidates. The test is offered 50 times a year.
On the other hand, the revised TOEFL paper-based test, which replaced the TOEFL PBT test analyses the writing, reading, and listening skills of the candidates. In this test, speaking skills cannot be measured because of the limitations of capturing spoken responses.