When typing into Google’s search engine for anything and everything, you are creating a ‘search query’, which will provide you with pages of results relevant to what you have typed. You will notice that within the search results pages, there is a sponsored links section to the right of the main results, where advertisements are contained.
So when you see multiple 25-character headlines in the sponsored links area, you have “triggered” a keyword the particular advertiser included in their advertising campaign. This is because Google Adwords uses keyword-based advertising to target advertisements to what you have searched for.