what google adwords do

Advertising on Google Ads (Google AdWords) obviously has a cost (unless you have "Google Ad Grants"). For example, Google has set up an online auction system that puts companies that want to bid on the same keywords into competition.
Automated Adwords
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Some Statistics

The average click-through rate for an ad in the first position is 7.94 %. The average click-through rate on AdWords paid search is about 2 %.

Paid traffic such as Google Adwords converts 50 % more than free traffic.

Volume of store visitors, Google tracked from ad clicks : four billion.