Now that we have a brief overview of the functionalities provided by an advertising system, we can look at the architecture of the advertising system and understand where Solr fits in the picture.

The system would receive parameters such as placement of the ad, keywords related to the ad, and the type of ad to be displayed. On the basis of these parameters, the system will identify the ad to be displayed. Most of the data required for ad display is stored as a browser cookie on an end user's system. This cookie can contain tracking and targeting information. This cookie information is sent over to the ad distribution network and is used for identifying the ad to be displayed and also for gathering the tracking and behavioral information.

The ad system generally works on JSON, HTML, and JavaScript frameworks on the frontend. JavaScript is used on the client side and is placed on the web page on which the ad is to be displayed. JavaScript handles all...