As advertisers collect data across multiple external websites about a user's online activity, they can create a detailed profile of the user's interests to deliver even more targeted advertising. This aggregation of data is called behavioral targeting. Advertisers can also target their audience by using contextual to deliver display ads related to the content of the web page where the ads appear.:118 Retargeting, behavioral targeting, and contextual advertising all are designed to increase an advertiser's return on investment, or ROI, over untargeted ads.
One way to improve email deliverability is to remove unengaged subscribers. If you notice that certain subscribers have not opened your emails or engaged with your company content or site in quite some time, you may want to reach out to see if they still want to be on your email list. If they don’t respond, consider removing them to improve deliverability.
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