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The percentage of recipients who unsubscribe from an email after it is sent. In large-scale marketing, some unsubscribes are expected, but it’s a metric that can be monitored to ensure you aren’t putting off your audience with either the frequency or messaging of your email advertising.

In web terms, crawling refers to minimally invasive programs that scan webpages and entire websites to catalog their content. Websites should be crawlable and easily interpreted by these programs so that your site is properly represented on search engines like Google and Bing.

A Viewport is the visible area of a webpage. The viewport for a mobile device will be smaller than a desktop screen, and there is considerable variance within device types as well.

Websites need to be responsive to account for differing viewport sizes to avoid massive visual errors and user frustration, which is why responsive web design is so important.