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## Sync types

The fundamental choice to make in Polytomic is whether to use Model Syncs or Bulk Syncs:

* Use Bulk Syncs if you want to sync untransformed data into SQL
  databases, data warehouses, spreadsheets, and cloud storage systems like S3 (this
  is the 'ELT' pattern: Extract, Load, and Transform).

* Use Model Syncs for all other use cases:
  * Syncing data to business systems like Salesforce, HubSpot, NetSuite, and so on.
  * Transforming data at the source (e.g. with custom SQL) before syncing it into any destination (including data warehouses).

Model Syncs require defining a data model first. A data model is a
reusable view of fields from your source, either defined literally or
through a transformation query (SQL, MongoDB, CosmosDB, Salesforce's SOQL, etc).