There exist two types of IELTS: IELTS Academic and IELTS General Training.
The IELTS Academic is intended for those applying for higher education or professional registration in an English-speaking environment. It features mostly academic language and assesses whether you are ready to begin studying or training. This test is widely accepted by educational institutions around the world.
The IELTS General Training is for those who are going to English speaking countries for secondary education, work experience, or training programs. It is also a requirement for migration to Australia, Canada, New Zealand, and the UK. The test focuses on basic survival skills in broad social and workplace contexts.
Both types of the test feature the same sections and are of the same length. However, the Listening and Speaking sections are identical for both Academic and General Training tests, whereas the Reading and Writing section differ. See our IELTS page for more information about this.
If you are not sure which test type you should take, contact the educational institution or the organization that requires you to take IELTS for more details.