Merge pull request #5146 from DonaldKai/patch-3

Update index.mdx

Author: djw-m

advocacy_docs/pg_extensions/advanced_storage_pack/index.mdx

@@ -17,7 +17,7 @@ EnterpriseDB offers three TAMs in the Advanced Storage Pack.
 
 ## Bluefin
 
-Bluefin is designed to provide data compaction and delta compression, which makes it particularly useful for storing time-series data, common in IoT and monitoring use cases.
+Bluefin is designed to provide data compaction and delta compression, which makes it particularly useful for storing time-series data, common in IoT and monitoring use cases. Delta compression is a way of storing data in the form of differences (deltas) between datasets between consecutive tuples. This reduces the amount of data that needs to be stored or transmitted, especially when there are small or constant changes between data tuples.
 
 In its design, UPDATE and DELETE operations aren't permitted. This design allows for a much smaller tuple header. It also allows for tuples to be stored as compressed deltas of other tuples and eagerly freezing of pages as soon as the page is full. The result is that Bluefin tables accept only INSERTs, but they are able to reach a much higher density of tuples per page. This ability leads to faster reads on such append-only tables.