What is a CDN, How Does it Work, and What are its Benefits and Drawbacks?

SEO
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Friends, today I got HTTPS. I will implement it and share the benefits and drawbacks with you.
What I am mainly curious about is the CDN feature. Where should we get this from? If we get it, will there be issues with the indexing of our images? What kind of problems might occur or what are the benefits? Can someone knowledgeable about this share with us?

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Htps nerden nasi aldiniz

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namecheapten.