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Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds, all within a developer-friendly environment. CloudFormation uses templates, configuration files defined in YAML syntax, that are human readable and can be easily edited. An OAI is like a virtual user through which CloudFront can access private bucket data. After creating OAI and using it in CloudFront, we need to update bucket policy, So that CloudFront with an OAI can access it.