<p>Digital marketing is data-centric and effective marketing requires collecting, collating, and analyzing data from several data points. A data layer and the Google Tag Manager (GTM) is the code and tool that makes collecting data from your website an effective and efficient process.</p>
source https://www.mageplaza.com/blog/data-layer.html
source https://www.mageplaza.com/blog/data-layer.html
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