GMB stands for Google My Business, where it is possible to define info about your company (contact info, the address, product photos, ...)
When it is being searched on google map, only the results of the same nich are shown.
It is also possible to define the products you provide, as well as their price, so it is possible to compare value / price ratio.
Also upload photos of exterior, interior, team, products and project your GMB has participated on, as a refferal.