Explain Glacier Data Retrieval Process.

The glacier can be used for archiving data. The data going to Glacier can be stored for years or even decades; however, they can't be immediately accessed. So unlike other S3 storage types, which use buckets to save objects, in Glacier, create archives, and whenever there is a requirement of data within a specific archive, initiate an archive retrieval job. There are three kinds of archive retrieval jobs. The main difference between these retrieval job types is the speed of retrieval. The first type is called expedited. Expedited retrieval type allows quick access to the data; however, the data should be less than 250 MB to be retrieved in a timely manner. The second type of retrieval job calls Standard. Archives can be accessed within 3 to 5 hours. And the third type is called Bulk. This is a cheap retrieval type and can be used to retrieve a huge amount of data, even petabytes. The Bulk retrieval jobs can take between 5 to 12 hours. So, after retrieval job type is selected, create the job and then wait for the completion of the job followed by the notification, and after that, download the data.