- Side-by-side extensions are independent of the SAP S/4HANA version.
- Side-by-side extensions mean extension and integration with custom or standard business applications of the SAP Business Technology Platform (BTP). This is either via stable APIs or through business events from an SAP product, for example, SAP S/4HANA.
- All side-by-side extensions are technically implemented outside the core of SAP S/4HANA. As a result, remote communication between the extension and the extended app is required.

Let’s take a look at side-by-side extensibility use cases.