Here, the application writes data to the cache which stores the data and acknowledges to the application immediately. Then later, the cache writes the data back to the database.

This is very similar to to Write-Through but there’s one crucial difference: In Write-Through, the data written to the cache is synchronously updated in the main database. In Write-Back, the data written to the cache is asynchronously updated in the main database. From the application perspective, writes to Write-Back caches are faster because only the cache needed to be updated before returning a response.