What is the difference between VIB and Insider Sephora?

Could you please clarify the distinction between VIB and Insider Sephora for me? Are they both membership programs, and if so, what sets them apart in terms of benefits, exclusivity, or any other key features? Are there any specific criteria or requirements for joining each program, and are there any differences in the types of rewards or discounts offered to members? Additionally, are there any other notable differences that a potential member should be aware of when deciding between the two?