You can use extensions to expand the standard range of Shopware functions. The extensions are managed via the extensions manager.
The extended functions of Shopware Evolve and Shopware Beyond are also provided as extensions. If you have purchased a corresponding plan, the extensions are available to you both in your Shopware account and in the Extensions Manager in the "Purchases" article.
Further information, e.g. on the installation of extensions, can be found here.