Online ads come in various shapes and sizes. Regardless of the appearance aspects they can be broadly categorized into two - Contextual ads and Non-contextual ones.

Contextual ads
Contextual ads are the ones which get displayed on your pages based on the context or content of your page. For example, if you are writing an article or post about ‘cake baking’ it is highly likely that the contextual ads that appear on that page (via Google AdSense or other ad networks) may contain ads of ‘Cake recipes’ sites or ‘Birthday cake’ vendors etc. Content link ads - where the actual words on the page itself forms ad links - is also considered contextual ads.
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