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The Google Tag is a messenger for sending your website data to connected 'destinations' like Google Ads or Analytics. How To Add A Google Tag To... · How To Set Up Your Google...

結論，GA 預設提供gtag.js，請工程師貼上後就可以看用戶數、流量來源、page view 等，這是大部分網站的現況。GTM 有學習門檻，甚至可以獨立出來當作一門學科。

This page explains how to set up and deploy a Google tag on your site using the gtag.js framework. About Google Tag Manager · Configure Google products... · API reference

The Google tag (gtag.js) API consists of a single function, gtag(), with the following syntax: gtag(<command>, <command parameters>);

Gtag is Googles new common tag that provides the simplest way of tagging your web pages. This will replace all other Google tags on your site.

GTAG is the tag that you add to your site to send data to a number of Google products, including Google Analytics. GTM is a Google product that ...

The Google tag lets you send data from your website to linked Google product destinations to help you measure the effectiveness of your website and ads. The ...

The Google tag is a single tag you can add to your website to measure website and ads performance. The Google tag is needed to send data to Google Ads and ...

The Google tag is used to measure the effectiveness of your website and ads. Through Google Tag, you can send data from your website to connected destinations.

The new Google Tag uses the same mechanism of Global Site Tag and Google Tag Manager to deploy once and update continually.