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What is the meaning of PoP?

On “Design of a CDN” page.

Hi Virkumar!
The term Pop refers to the Point of Presence that are located data centers responsible for communicating with users in their geographic vicinity. Basically two or more networks share a connection here. Their main function is to reduce round trip time by bringing the content closer to the website’s visitor. Each CDN PoP typically contains numerous caching servers.
Hope it helps.
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