WIFI in TVs? Why?

[Dede]

Wondering if these new Smart TVs can use their WIFI capabilities to stream HD video? Or is it only to browse the Net?

[AB16]

I can play videos, music and look at pictures from my PC to my TV via WIFI.
Now if you can tell me how to go from my DVR/TV to my PC I would like to make a copy of a program I recorded on my DVR.