A vulnerability scan asks: which known weaknesses appear on these hosts or URLs, today, according to a plugin database. A penetration test asks: what could a motivated human actually do to this system, with the access we agreed, in the time we bought.
Those sentences are not marketing. They are different statements of work. A scan is a good weekly or monthly hygiene control. It is a poor annual 'independent pentest' for a bank, a hospital or a SOC 2 auditor.
What a scan is good at
Missing patches, default creds on a forgotten host, cookie flags, TLS configuration, known CMS issues. Breadth. Repeatability. Cheap coverage of the obvious.
What a scan cannot see
Business logic, broken object-level authorisation, chained attacks, the admin function hidden from the UI, the IDOR that only works as a slightly privileged user. That is most of the findings that end up in Australian notifiable-data-breach write-ups involving web applications.
VAPT, in one line
Vulnerability assessment plus penetration testing: use the scan for breadth, use the human for depth, and never let the scan write the report. That is how we work. Details on the methodology page.
If a vendor cannot explain this distinction without a slide titled 'our secret sauce', keep walking.