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JS, or Javascript, is a programming language used on numerous websites. Most sites you visit incorporate JS in some way to define the behavior of the site when a user takes particular actions.

Keyword stuffing is a “black hat” SEO technique, wherein sites will “stuff” a webpage with words on a topic they’d like to rank for, but without concern for the usability, accuracy or informational value of the page.

This practice is frowned upon by search engines and can damage your search rankings if you engage in it.

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.