Review required v/s under review

Hello mates I have been reading this very lately in several groups asking the difference between review required and under review . Mostly I have seen this on eligibility section people are freaking out and I’m one among them. Any one who have an idea of it show us some light

I also got the same reply from Ralph’s office, stating that the review required for eligibility. Please someone clarify what will happen, I am so scared that they might refuse visa for me.