Final answer:
Mini-applications in banner ads that provide interactive and dynamic content access are called widgets.
Step-by-step explanation:
Mini-applications embedded in banner ads that permit consumers access to dynamic content from external sources are called widgets. These small applications are interactive and can often provide users with real-time information, such as news updates, weather forecasts, or stock market tickers, without needing to leave the webpage hosting the ad. They are distinct from other forms of digital advertisements such as banners, which are typically static images; pop-ups, which open a new window or tab; and interstitials, which are full-page ads that appear before the intended content.