ELI5: Explain Like I'm 5

Session multiplexing

Session multiplexing is a way of connecting two different kinds of networks together. It's like making a bridge between two roads, so you can get from one road to another without having to backtrack. In this case, two different kinds of networks are connected together, so you can send and receive information between both of them at the same time. It's like a tunnel between networks, so you get there faster.