CORS, Preflight Request, OPTIONS Method | Access Control Allow Origin Error Explained

What is CORS?
What is Cross Origin?
Are subdomain, host, port, protocol fall under Cross-Origin mechanism?
How does Cross Origin Request Sharing works behind the scenes?
What is CORS preflight?
What is the OPTIONS call?
What are the additional HTTP Headers required?
Does server always make Preflight options call in CORS protocol?
What browser versions support CORS?
Access Control Allow Origin Error?
How to solve CORS Error?
How to resolve CORS issue in Google Chrome?
MDN Link - developer.mozi...
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