Behavioral targeting is a digital advertising technique that involves showing ads to users based on their past behavior or interests. This is typically done by tracking the online activities of users, such as the websites they visit or the search terms they use, and using that information to serve them relevant ads. For example, if a user visits a travel website and searches for flights to Paris, they may be shown ads for hotels or attractions in Paris when they visit other websites. Behavioral targeting can help advertisers to reach users who are more likely to be interested in their products or services, and can improve the relevance and effectiveness of their advertising campaigns.