Why Ignore bins

SystemVerilog
1

Whats the use of ignoring a bin value when we can set the constraint for same value

2

In reply to Raja VA:
The key benefit of ignore_bins is excluding values that overlap with the explicit bins. Remember that as soon as you specify explicit bins in a coverpoint, any bin value not specified is already ignored.

coverpoint p {
   bins exp[]= {[1:100]};
   ignore_bins ign = {23,45,67};
}

versus having to write

coverpoint p {
   bins exp[]= {[1:22],[24:44],[46:66],[68:100]};
}