What is Varnish, and how is it used with Magento?

Answer: Varnish is a web application accelerator and caching reverse proxy designed to improve web performance by caching HTTP responses. When used with Magento, Varnish helps to enhance the speed and scalability of online stores by storing static content and speeding up page load times, thereby reducing the load on the web server. It can cache frequently accessed pages and serve them quickly to users without querying the backend for every request, ultimately leading to a better user experience and reduced server load.

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