Searches a monthHow many people typed that phrase into Google in an average month. Google rounds these, so read them as a floor rather than an exact count.
What a click costsWhat an advertiser pays Google for one person clicking once on that phrase. Not a job, not a phone call — one click. It is the going rate for attention in that suburb.
Why it changes by suburbEvery postcode has its own demand and its own competition, so the same a trade work can cost fifteen times more to advertise one city over from another.