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Insight: Insight is the understanding cause and effect based on the identification of relationships and behaviors within a model, context, or scenario.
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A/B Testing: A/B Testing is also known as bucket testing or split-run testing. It's a method of user-experience research where by there are 2 variants of a single variable. A user will be tested in response to variant A against variant B, ultimately to determine the more effective variant.
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Copywriting: Copywriting is the act, or occupation of writing text for the purpose of advertising or other forms of marketing. The product, called copy, is written content that aims to increase brand awareness and ultimately persuade a person or group to take a particular action. Copywriters help create billboards, brochures, catalogs, jingle lyrics, magazine and newspaper advertisements, sales letters and other direct mail, scripts for television or radio commercials, taglines, white papers, social media posts, and other marketing communications.