Your IELTS band score will be given to you as a number between 0 (Did not attempt the test) and 9 (Expert User).  A band score is not always expressed as a whole number but may be something like 6.5 or 7.5.  You will receive a band score in each of the 4 modules – Listening, Reading, Writing and Speaking.  Your four scores will be averaged to arrive at an Overall Band Score.  Your goal is to achieve as high an Overall Band Score as possible.  There is not a pass or fail measure in the IELTS test, but you will have a target band score that you are aiming to achieve.   The band scores you will need to achieve will depend on your purpose for sitting the IELTS, so be sure you check with your educational institution of choice or your local immigration lawyer for your specific requirements.