C#: What is the Channel<T> type in C#?

1var channel = Channel.CreateBounded<int>(new BoundedChannelOptions(100)
2{
3    SingleReader = false,
4    SingleWriter = true,
5    FullMode = BoundedChannelFullMode.Wait
6});

1await channel.Writer.WriteAsync(item);
2channel.Writer.Complete();  // Signal no more items

1await foreach (var item in channel.Reader.ReadAllAsync())
2{
3    await ProcessAsync(item);
4}