A hard bounce is a permanently undeliverable email caused by invalid addresses or blocked servers.
Heatmaps visually show where users interact most on a webpage using color-coded data. They help optimize layout and design based on real user behavior.
Heuristic Analysis is a usability inspection method where UX experts evaluate a website's interface against a set of established design principles.
A holdout group is an audience segment intentionally excluded from a campaign to measure its incremental impact.
An HTML email uses code to include images, colors, and styled text. It’s more visually engaging than plain text and supports interactive elements.
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