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+# Plugins
+
+Swift Package Manager supports plugins that can extend package functionality.
+
+## Overview
+
+There are two kinds of plugins in SwiftPM:
+
+- **Command plugins**, which are invoked explicitly by users.
+- **Build tool plugins**, which are applied to targets during the build.
+
+## Build Tool Plugins
+
+Build tool plugins are executed by the build system and may generate files
+that are used as inputs to compilation.
+
+## Plugin Outputs and Visibility
+
+Plugins may generate files that are tracked by the build system for incremental
+builds. Generated files are associated with the target the plugin is applied to.
+
+Plugins do not form a pipeline, and outputs produced by one plugin are not
+guaranteed to be visible to other plugins.
+