Data Layer variables automatically persist across different web pages

Data Layer variables do not automatically persist across different web pages. Each page load typically initializes a new Data Layer, meaning variables set on one page are not inherently available on the next unless explicitly pushed again or stored using other methods (like cookies or local storage). Google Tag Manager processes the Data Layer on each page load. If you need data to persist, you must re-push it to the Data Layer on subsequent pages or use a persistent storage mechanism.