How would a digital marketing consultant describe the Google tag to a new advertiser?

The selection is correct because the Google tag is officially defined as the JavaScript framework (gtag.js) that serves as a single, unified tag for sending data to Google’s measurement platforms, such as Google Ads and Google Analytics 4. While it works in tandem with tools like Google Tag Manager, its primary technical identity is a library that simplifies the implementation of website tracking by allowing advertisers to manage their measurement and conversion tracking through a streamlined, consistent code structure across various Google products.