IELTS is known as International English language testing system. There are two versions of IELTS-
Paper based and computer based. The one who is familiar with computing system and has a fast typing is encouraged to be sit for a computed based test. If not then go for the paper one.
First but foremost an individual have to go through a speaking test which will be held 2 or 4 days before the test depending on the slot and it usually takes 10 to 15 minutes for a video call or physical speaking one on one test.
Secondly, the 3 hour test contains 3 of the modules listening , reading & writing.
IELTS- Accepted & required by all of the top class universities and companies.
UKVI IELTS- This form of IELTS only needed for people going to United Kingdom for study & work purpose.
IELTS Life Skills- This form of IELTS only needed if you have family in outside country. This test is easy only contains 2 modules listening & speaking.