Every check of a credit file is logged, but only some are visible to other lenders and only some influence scoring. The distinction turns on why the check was made.
What separates the two types
A hard inquiry is recorded when a lender examines a file in order to decide on a credit application. It is visible to other lenders and is retained for a period.
A soft inquiry covers checks made for other purposes, including eligibility quotes, existing account reviews and a borrower looking at their own file.
Soft checks are recorded on the file the borrower sees but are not shown to other lenders and do not feed the score, which is the practical difference.
Why hard inquiries carry information
A hard inquiry indicates that credit was sought. On its own that is unremarkable, and in volume it is not.
Several applications in a short window can indicate either shopping for the best terms or a borrower being declined repeatedly and trying elsewhere.
Scoring models cannot distinguish the two directly, so they treat clustering cautiously. The effect is generally small and fades as the inquiry ages.
How rate shopping is handled
Applying to several mortgage or car lenders to compare terms would otherwise be penalised as repeated credit seeking, which would discourage comparison.
Many scoring models therefore treat multiple inquiries of the same type within a short window as a single event, so the comparison itself is not punished.
The window and the covered product types vary between models and markets, and the allowance generally does not extend across different kinds of credit.
Why pre-approval is not approval
Eligibility tools and pre-approvals typically use a soft check against a partial view of the file, so they leave no visible mark.
The result is an indication of likelihood rather than a decision. A full application follows with a hard check and can still be declined.
The gap arises because the soft check does not see everything a full assessment does, including income verification and affordability testing.
Why inquiries matter less than they seem
Inquiry data is one of the smaller inputs in most scoring models, well behind payment history and the amount owed.
The larger effect of an approved application is usually the new account itself, which changes the average age of accounts and the total credit outstanding.
Treating inquiries as a serious constraint tends to cause more harm than good, particularly where it deters someone from comparing terms on a large borrowing decision.