What are transferring contracts?

Dear readers,
I wanted to ask what the transferred packages are. When I click on a client and then on client information there is different data. What is the difference between higher transmitting packets and lower transmitting packets. Many thanks in advance to all answers!

You mean Packet Loss (in) and Packet Loss (Out) in TeamSpeak 5?

No I mean the “transferred packets”. As far as I know, TeamSpeak3 also has them.