Question

What
is GMT? What is it need for​

Answer 1

Answer:

Greenwich Mean Time (GMT) is the time measured on the Earth's zero degree line of longitude, or meridian. This runs from the North Pole to the South Pole, passing through the Old Royal Observatory in the London suburb of Greenwich.

Explanation:

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Answer 2

Google Tag Manager (colloquially known as GTM) is a script (or tag) management system that allows you to install tags, scripts and other helpful snippets of codes to your website directly. ... You can choose if you want to keep track of one page of your site or all of it, depending on how you set it up in GTM.

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