# Extensions Developement

This section covers developement of extensions that can be added to the Servoy core product.

There are 2 main area's of developement 1 is the [Components And Services](/reference/extension-dev/component_services.md) and the other is server side [Java Plugin](/reference/extension-dev/serverside.md) development.

Component and Services are executed in the browser and build with Angular written in Typescript. The api is declared in the [spec](/reference/extension-dev/component_services/spec-file.md) and exposed in in Servoy scripting api through elements.xxx (components) or through the "plugins." node (services)

Server side plugins are written in Java and do run server side in the client that can be accessed through the exposed api on the "plugins." node.


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