Explain the mechanism of updating object data in AWS S3 storage.

In Amazon S3, objects are immutable, meaning you cannot update the content of an object directly. To update an object's data, you need to upload a new object with the same key (name), which will overwrite the existing one.

The update process looks like this:

1. Upload a new file or data with the same key to the S3 bucket.
2. The new object replaces the old one, and all subsequent requests will receive the updated version.

It is important to note that S3 provides read-after-write consistency for new objects and overwrite operations, meaning that after a successful upload, the new object is immediately available for reading.

If you need to preserve object versions, you can enable versioning on the bucket, which will keep old versions and allow you to restore them if necessary.