If you are using the IPv6, then you may need it. Teredo Tunneling is used to connect to IPv4 devices in the compatibility mode while you are using IPv6 yourself.

Is Teredo Tunneling adapter necessary?

Until networks and the internet have universally adopted IPv6 and IPv4 is consigned to history, Windows computers require the Microsoft Teredo Tunneling Adapter. Usually it is invisible and does its work behind the scenes.

What is the use of Teredo tunneling pseudo-interface?

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.