hard bounce – A situation where an email is permanently rejected because the intended email address is invalid or doesn’t exist.
hashtag – A linked word or phrase following a hash symbol (#), primarily used on social media sites or apps to group conversations or content around niche topics.
heatmap – A graphical representation of data where varying degrees of a single metric are shown using colors.
hit – Request of a file from a Web server.
house ad – Self-promotional ad a company runs on their own site/network to use unsold inventory.
HTML banner – A banner ad using HTML elements, often including interactive forms instead of (or in addition to) standard graphical elements.
HTML email – Email that is formatted using Hypertext Markup Language, as opposed to plain text email.
hybrid model – A combination of two or more online marketing payment models.