There are Pages where your customers make decisions.
When people need something, they will search google. We all search for things we want to buy or we search for information.
There are 6,586,013,574 searches each day. And there are 4,464,000,000 searches on Google alone.
When you use google adwords, you promote your offer with an ad on top of the Google search results page. By doing so you are showing your ad to the very people who are looking for your solution to their problem.
In that moment those people have a strong intention to buy. There is no better moment for your business to appear in front of your potential client.
You are not interrupting them. You are not disturbing them. They are looking for you. Or your competitors.
Since they are searching for a solution, you can go straight to the point and sell them your product right away.