IELTS or International English Language Testing System is an English exam to test the level of English skills of individuals who wants to STUDY, MIGRATE, and WORK in an English Speaking country. It has 2 Modules. General and Academic module. General is used by skilled workers and those who wants to migrate. While Academic is advisable for individuals who wants to study. The band score is from 0-9 as 9 is the highest score.
TOEFL iBT or Test of English in a Foreign Language internet Based Test is also an English exam for students who wants to study in an English Speaking country and is also used by professionals such as PT, and RN's in some States in US as a requirement to apply for a job. The score is from 0-120.
Both are divided into 4 parts. Listening, Reading, Writing and Speaking.
Better inquire first what test you really need before taking it and make sure to take it once and pass it once.