The SLD contains a Software Catalog of all installable SAP products and software components. The Software Catalog includes information about support packages and dependencies between the products and software components. This information is the basis for the description of the system landscape.

In addition, third-party products and software components can be implemented in a system landscape. Third-party products can be standalone applications or additional modules for SAP applications. In the SLD, you have to create third-party products and software components manually.

For more information about the logic behind the products and software components, see Products and Software Components.