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CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. A long acronym, but one that simply refers to a basic test that humans can answer quite simply but computers struggle to solve. It is used as a security precaution on many sites.

CAN-SPAM is an acronym for Controlling the Assault of Non-Solicited Pornography and Marketing, referring to a legislative act from 2003. It’s a law that sets national standards for commercial emails. In order for mass emails to be legal, they must comply with CAN-SPAM guidelines.

Schema markup is metadata for a web page that can define certain attributes of that page. It helps categorize and define site attributes for search engines. It is sometimes referred to as structured data.