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Content that is specifically curated for the person receiving it. The use of tracking and analytical tools can give you information on user behavior that can allow for this level of personalized advertising and content.

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.

In digital marketing, a benchmark is a specific metric that you compare results to. A benchmark can relate to impressions, clicks, open rate, sales, or many other metrics. An established threshold is then used to determine success or failure of a particular campaign or piece of content. Benchmarks for an email campaign, for example, might be 20% open rate, 2% click through rate, and 0.5% sales rate on a product that the email is highlighting. 

The success or failure of the campaign would be measured against these numbers. Ideally, you’re developing benchmarks based on past campaign results in order to create personalized benchmarks for your business that allow you to compare across marketing channels.