What is Behavioural vs contextual advertising?

Behavioral advertising is the practice of collecting data about a person's online activity and using it to target them with advertising. This type of advertising is usually targeted based on the person's browsing history, but can also be targeted based on their search history, location, and other factors. Contextual advertising is the practice of placing ads on websites or apps that are related to the content of the site or app. The ads are usually targeted based on the keywords that are used on the site or app, or based on the content of the site or app.