Short version: NAP stands for name, address, and phone number: the core contact details used to identify a local business.
In local SEO, NAP consistency means the same business details appear correctly on the website, Google Business Profile, directories, maps, citations, and other public listings. Inconsistent data can confuse people and make the business look less reliable.
NAP matters most when customers need to visit, call, or compare local options. It should be easy to find, written consistently, and kept up to date whenever the business moves, changes phone number, or adjusts service areas.
In practice, NAP details should be treated as operational data, not decorative footer text, because old addresses or phone numbers can quietly lose real inquiries.
Related terms: Local SEO, Google Business Profile, and Local citations.