What exactly is a Tag in GTM?

Xiaochuang: A tag is a piece of code typically used to send information to third parties, such as Google Analytics. Tags are often provided by analytics, marketing, and support providers to help website owners integrate their products into their websites or mobile applications.
With Google Tag Manager, developers no longer need to maintain these JavaScript code snippets in the website's source code. Website owners can specify which tags to trigger and when to trigger them from within the Google Tag Manager user interface. Common tag examples include: Google Analytics PageView tags, Google AdWords Conversion tags, Facebook Pixel tracking tags, and LinkedIn Insights tags.
In addition, tags can also be code snippets that perform specific functions on a website, such as code for an email pop-up tool, code for changing browser colors, etc.
Q: How can tags near the bottom of a page help Google discover it?
1. Use the appropriate HTML element
to define the footer area.
2. Add a tag in the page head
that points to the sitemap. A sitemap lists the pages on a website and helps search engines discover them.
3. Use appropriate tags in the page head
to provide metadata about the page.
4. Make labels clear and concise so that Google can better understand their meaning and purpose.