By default, objects on S3 are private. But what if you want to allow others to download an object, but you don’t want to deal with user creation and IAM policies? One way to achieve this is by distributing a presigned URL to the object.
A presigned URL is a way to make an object public for a certain period of time.
When you create a presigned URL for your object, you must provide your security credentials, specify a bucket name, an object key, specify the HTTP method (GET to download the object) and expiration date and time. The presigned URLs are valid only for the specified duration.aws