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+## Plugins System Components
+
+The **Plugins System** is a modular and extensible architecture that provides a flexible way to manage plugins in an application. It consists of several key components, such as the `IPluginsInstaller`, `IPluginsDiscoveryOrchestrator`, `IPluginsSystemResourceLoader<T>`, `IRepository<PluginSource>`, `IObsoletePluginsRemover`, and `IInstalledPluginLoader`, that work together to enable the discovery, installation, uninstallation and loading of plugins at runtime. The composition-based design promotes the use of composition over inheritance, allowing for extensible plugin management through the use of loosely-coupled components that can be easily replaced or extended without modifying the core logic of the system. This documentation provides an overview of the key components of the **Plugins System** and its functionalities.
+
+### Components of the Plugins System
+The Plugin System consists of the following components:
+
+1. **IPluginsInstaller**
+
+    The `IPluginsInstaller` interface is responsible for installing plugins, uninstalling plugins and listing installed plugins. It supports installing from various sources given that a **plugin package** stream is provided. 
+
+2. **IPluginsDiscoveryOrchestrator**
+
+    The `IPluginsDiscoveryOrchestrator` interface is responsible for orchestrating the discovery process of plugins. This component interacts with various **plugin source**s and different discovery mechanisms to discover available plugins.
+
+3. **IPluginsSystemResourceLoader\<T\>**
+
+    The `IPluginsSystemResourceLoader<T>` interface is responsible for loading resources required by the plugin system, such as assemblies, configuration files, or other resources, from different sources. The T type parameter represents the type of resources to be loaded, such as `IPluginDiscovererProvider` or `IPluginFetcher`.
+    
+    - **IPluginDiscovererProvider** represents a plugin system resource that creates `IPluginDiscoverer` for supported plugin sources.
+        - **IPluginDiscoverer** represents a component that discovers available plugins from a *single* plugin source.
+
+    - **IPluginFetcher** represents a plugin system resource that is capable of fetching the plugin package from a discovered plugin. 
+    
+    For the `IPluginsDiscoveryOrchestrator` to discover plugins, at least one `IPluginDiscovererProvider` and the supporting `IPluginFetcher`(s) need to be loaded into the system.
+    
+4. **IRepository\<PluginSource\>**
+
+    The `IRepository<PluginSource>` interface is responsible for managing plugin sources provided by a plugin consumer. It supports adding and removing sources as well as notifying these changes.
+
+5. **IObsoletePluginsRemover**
+
+    The `IObsoletePluginsRemover` is responsible for determining which plugins are considered obsolete and removing the binaries from the application.
+
+6. **IInstalledPluginLoader**
+
+    The `IInstalledPluginLoader` interface is responsible for loading installed plugins into the application.
+
+
+### Usage
+
+#### Construct a Plugins System
+Creating a **Plugins System** requires all the components mentioned above provided. A client can either provide their custom implementation or use the default file system-based implementation provided by `Microsoft.Performance.Toolkit.Plugins.Runtime`. A file system directory is required which will be the root directory of the installed plugins. Additionally, a plugin loading callback and a logger factory need to be provided.
+
+```CSharp
+using Microsoft.Performance.Toolkit.Plugins.Runtime
+
+var ps = PluginsSystem.CreateFileBasedPluginsSystem(
+    @"\InstallationRoot",
+    (pluginDir) => pluginsLoader.LoadPlugin(pluginDir),
+    (t) => Logger.Create(t));
+```
+
+#### Discover Plugins
+1. Add a plugin source
+
+```CSharp
+ps.PluginSourceRepository.Add(new PluginSource(new Uri(@"http://fakeazure.com/1")));
+```
+
+2. Add a discoverer provider and a fetcher
+```CSharp
+ps.DiscovererProviderResourceLoader.Add(new AzurePluginDiscovererProvider());
+ps.FetcherResourceLoader.Add(new AzurePluginFetcher());
+```
+
+3. Discover all available plugins in their latest version from `"http://fakeazure.com/1"`
+```CSharp
+var plugins_latest = await ps.Discoverer.GetAvailablePluginsLatestAsync(CancellationToken.None);
+```
+
+4. Discover all versions of a particular plugin from `"http://fakeazure.com/1"`
+```CSharp
+var plugins_allVersions = await ps.Discoverer.GetAllVersionsOfPluginAsync(
+    plugins_latest.First().Info.Identity, CancellationToken.None);
+```
+
+#### Install and Uninstall Plugins
+1. Install a discovered plugin
+```CSharp
+await ps.InstallAvailablePlugin(
+    plugins_latest.First(),
+    CancellationToken.None,
+    null,
+    Logger.Create<PluginsSystem>());
+```
+
+2. Install a local plugin package
+```CSharp
+using var stream = File.OpenRead(pluginPackagePath);
+var installedPlugin = await ps.Installer.InstallPluginAsync(
+    stream,
+    new Uri(pluginPackagePath),
+    CancellationToken.None,
+    null
+)
+```
+3. Uninstall a plugin
+```CSharp
+await ps.Installer.UninstallPluginAsync(
+    installedPlugin,
+    CancellationToken.None)
+```
+4. List all installed plugins
+```CSharp
+var allInstalledPlugins = await ps.Installer.GetAllInstalledPluginsAsync(
+    CancellationToken.None)
+```
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