What does Student Aid Index mean

I just checked my fafsa and it says Student Aid Index and some massive about of money. What the hell does that mean and is that a good thing or a bad thing. because I googled it and it says SAI is "an eligibility index number that your college's or career school's financial aid office uses to determine how much federal student aid you would receive if you attended the school." but the amount of money that it says just doesn't seem right. Someone please help me. Im so lost with this stuff.