GBP is Google Business Profile, the listing system used to manage business visibility on Google Search and Maps.
It matters because local buyers often make decisions quickly from maps, reviews, proximity, and location-specific pages. Local SEO connects online visibility to real-world calls, visits, appointments, and service inquiries.
Example
Example: A service-area contractor may use GBP to define service areas, collect reviews, post updates, and measure calls or direction requests from Google Maps.