In web development, a data layer is an architectural pattern and a conceptual layer within an application that sits between the user interface (UI) and the data source (e.g., a database or API). Its primary responsibility is to manage data flow and interactions, abstracting the complexities of the data source from the presentation layer. This promotes separation of concerns, making the application more maintainable, scalable, and testable. In web analytics, a data layer is a JavaScript object that is used to pass information from a website to a tag management system (TMS) like Google Tag Manager. The TMS then uses this data to populate tags for various analytics and marketing platforms.
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