Google Tag Manager (GTM) is a free tool provided by Google that allows you to manage and 

deploy marketing and analytics tags (like tracking codes or scripts) on your website or mobile app 

without modifying the code directly.

✅ What Does GTM Do?

GTM acts like a middleman between your website and these third-party tools. 

Instead of adding every tracking code manually in your website’s HTML, you just add one GTM container

 and then manage all other tags from GTM’s web interface.

🔹 Key Features

• ✅ Centralized tag management (no need to bother developers every time).

• ✅ Built-in templates (Google Analytics, Ads, etc.).

• ✅ Custom triggers (clicks, scrolls, form submits, video views).

• ✅ Version control & debugging before publishing changes.

• ✅ Works for websites + mobile apps.

🔹 Why Use GTM?

• Saves time & dev resources.

• Reduces errors from manual code edits.

• Enables faster marketing experiments.

• Improves data accuracy.

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⚡ Example:
Instead of asking a developer every time you want to track "Button X clicks," you set up a trigger in GTM → link it to Google Analytics or Ads → and boom, it’s tracked.