what is the function of terredo interface card

[2boiling]

recently removed it so i want to know what functionality will my pc have

 

[WyomingKnott]

"Teredo is a protocol that allows computers behind a NAT firewall (most home computers are) and without a native IPv6 connection to access remote IPv6 resources using only UDP protocol. The idea is that home users can start accessing IPv6 web services before their local connection supports the protocol, making the transition from IPv4 easier." So forget about it. Why did you bother to remove it?

From http://superuser.com/questions/22290/what-is-the-teredo-tunneling-pseudo-interface.