> ## Documentation Index
> Fetch the complete documentation index at: https://www.integrate.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ELT/CDC: Transforms

> Apply data transformations during replication in Integrate.io ELT & CDC. Use replacement rules and surrogate keys to modify data during sync.

Integrate.io ELT & CDC supports lightweight transforms that run during replication. Replacement rules let you modify, mask, or remap column values as data flows from source to destination without building a separate transformation pipeline.

<CardGroup>
  <Card title="Transforms - Replacement Rules" icon="arrow-right" href="/cdc/replacement-rules" horizontal />
</CardGroup>