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[[binary_plugins_advanced]]
= Binary Plugin

Creating your own custom plugin might be a great solution when Gradle doesn't offer the specific capabilities your project needs.
This is where binary plugins come in.

A binary plugin is a plugin that is implemented in a compiled language and is packaged as a JAR file.
Binary plugins must implement the link:{javadocPath}/org/gradle/api/Plugin.html[`Plugin`] interface.

== Implementing the Plugin Interface

For example, this is a very simple "Hello World" *plugin*:

====
include::sample[dir="snippets/fundamentals/developing-plugins/simple/kotlin", files="build.gradle.kts[tags=plugin]"]
include::sample[dir="snippets/fundamentals/developing-plugins/simple/groovy", files="build.gradle[tags=plugin]"]
====
<1> Extend the `org.gradle.api.Plugin` interface.
<2> Override the `apply` method.

=== 1. Extend the `org.gradle.api.Plugin` interface

Create a class that extends the `Plugin` interface:

====
[.multi-language-sample]
=====
.build.gradle.kts
[source, kotlin]
----
abstract class SamplePlugin : Plugin<Project> {
}
----
=====
[.multi-language-sample]
=====
.build.gradle
[source,groovy]
----
class SamplePlugin implements Plugin<Project> {
}
----
=====
====

=== 2. Override the `apply` method

Add tasks and other logic in the `apply()` method:

====
[.multi-language-sample]
=====
.build.gradle.kts
[source, kotlin]
----
override fun apply() {
}
----
=====
[.multi-language-sample]
=====
.build.gradle
[source,groovy]
----
void apply(Project project) {
}
----
=====
====

Let's take a look at a more realistic example next.

[.text-right]
**Next Step:** <<developing_binary_plugin_advanced.adoc#develop_binary_plugins_advanced,Learn how to develop Binary Plugins>> >>
