What is a sink in remoting vb.net

Hi!

Need some help to understand what a sink is in remoting.

Do I need to use it?
What is it for?
When should I use it?

for example what does this do

Dim serverProv As BinaryServerFormatterSinkProvider = New BinaryServerFormatterSinkProvider
 Dim clientProv As BinaryClientFormatterSinkProvider = New BinaryClientFormatterSinkProvider
  serverProv.TypeFilterLevel = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full
 Dim props As IDictionary = New Hashtable
 
        props("port") = 0
        Channel = New System.Runtime.Remoting.Channels.tcp.TcpChannel(props, clientProv, serverProv)

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