All Glossary Terms Web Analytics Terms Web Analytics All A G K O S Filter All A G K O S G Google Tag Manager (GTM) / Web Analytics Google Tag Manager (GTM) is a free tool that allows marketers, developers, and website owners to manage and deploy tracking codes and marketing tags on their website or app without editing the site’s source code. GTM works by placing a single container snippet on the site, which then controls all added tags such as Google Analytics, Facebook Pixel, conversion tracking, or custom scripts. This approach simplifies tag management, reduces the need for developer support, and helps improve site performance. Google Tag Manager includes features like tag templates, version control, preview mode, and error checking to support accurate and efficient data collection.