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A meta description is an HTML tag for a web page that describes the page briefly, summarizing it. 

Meta descriptions are read by search engines and often displayed for users. For example, the brief description for web pages you see in Google results is often pulled directly from the page’s meta description.

Once a prospective customer is in your database and can be contacted in some way, lead nurturing refers to the communications provided to that person in order to guide them further along the path toward your products or services.

A classic lead nurturing technique is via email marketing, wherein a series of emails will be sent that are intended to inform the person about your brand and increase their interest in trust in utilizing your products or services.

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.