Explanation for Pipeline Nodes?

I like to know what these pipeline nodes:

Code (CSharp):

1.  
2. pipelineAsset.CreateNode<ProjectStreamerNode>();
3. pipelineAsset.CreateNode<SyncObjectInstanceProviderNode>();
4. pipelineAsset.CreateNode<DataProviderNode>();
5. pipelineAsset.CreateNode<MeshConverterNode>();
6. pipelineAsset.CreateNode<MaterialConverterNode>();
7. pipelineAsset.CreateNode<TextureConverterNode>();
8. pipelineAsset.CreateNode<InstanceConverterNode>();
9.  

MeshConverterNode, MaterialConverterNodeand and TextureConverterNode are obvious to me, InstanceConverterNode I suppose is responsible for instantiating the entities into GameObjects but the rest is not clear to me.