Responsiveness is about the bid itself: did you bid the work as specified, on the right form, with the bid security, addenda acknowledgments, and certifications attached? Miss a material item and the agency must reject the bid, even if your price is lowest. The distinction matters because responsiveness is judged at bid opening, with no second chances to cure a substantive defect.
The line between a fatal defect and a waivable one turns on materiality: a missing bid bond or a changed price goes to the substance of the offer and can't be fixed after opening, while a trivial irregularity — an obvious typo or a missing page number — can often be waived as a minor informality. Bidders shouldn't count on that grace, though, since the call rests with the agency. Nonlinear helps you stay responsive by reading the documents and assembling a checklist of every required submission item, so a forgotten form or unacknowledged addendum doesn't disqualify an otherwise winning bid.
