# Introduction to tagging and the Google tag

[Video](https://www.youtube.com/watch?v=PFHY1071B6M)

Tagging is the process of adding snippets of code (called tags) to each page of
your website so you can learn about the people who visit your site and how they
interact with it.

Tagging is an integral part of many measurement products, including Google Ads,
Google Analytics, and many third-party products too.

Whether you want to know about your most popular blog posts, most effective
landing pages, or most popular products, the data you'll collect through tagging
lets you make more informed decisions about your site and your marketing
strategies.

## Get started with the Google tag

The Google tag is a single piece of code that you can find in Google Ads, Google
Analytics, and other similar Google products. Instead of managing multiple tags
for different Google product accounts, you can use the Google tag across your
entire website and connect the tag to multiple destinations.

## Set up the Google tag

Setting up the Google tag depends on how your site is set up and how you can
change the code. You can implement the Google tag on your site in one of the
following ways:

- **Google Tag Manager**: A tag management system that lets you set up and
  manage tags on your site without changing your code. To use Tag Manager, you
  add 2 snippets of code to each page of your website. After you add the
  snippets to your code, you don't need to change your code much after that;
  instead, you can set up and manage your tags through the Tag Manager website.

- **gtag.js**: A JavaScript framework that lets you send data from your site to
  Google measurement products. To set up gtag.js, you add 1 snippet of code to
  each page of your site. To use gtag.js effectively, you need to be comfortable
  changing JavaScript on your site.

If you use a website builder or content management system like Shopify, Wix, or
Wordpress, the website builder or content management system may offer an
integration for setting up Tag Manager or gtag.js on your site.

To set up measurement and advertising tags in a mobile app,
use the Google Analytics for Firebase SDK. Then, you can also
use Tag Manager to modify and route data in the mobile app.

## Next steps

- [Plan your tag setup](https://developers.google.com/tag-platform/devguides/prerequisites)
- Set up the Google tag with:
  - [Tag Manager](https://support.google.com/tagmanager/answer/6102821)
  - [gtag.js](https://developers.google.com/tag-platform/gtagjs/install)
  - [a website builder or CMS](https://support.google.com/tagmanager/answer/12403447)
  - [the Google Analytics for Firebase SDK](https://firebase.google.com/docs/analytics)