JEE Mains and JEE Advanced have some differences though they are inter connected with each other.
They have differences in terms of syllabus, paper pattern, accepting Institutes etc.
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Number of attempts are also different for both exams – For JEE Mains students can apply for 3 years and candidates can appear for JEE Advanced only 2 consecutive years.
The main difference between both examinations is difference in their accepting institutes. Through JEE Main candidates get admission in NITs/IIITs/CFITs on the other hand IITs and ISM Dhanbad provide admissions through JEE Advanced.