They are a global tier1 carrier which provides connectivity to other ISPs (such as Google, Comcast, etc) around the world. Not sure why it shows Tata though.

I've got a friend that have had to deal with Tata Communications in a UK datacenter and he said they were the absolute worst company to deal with.

Comcast has a link with Tata Communications that it apparently runs at a 100% capacity day in day out ... there was a story about it not too long ago.

tata's running the isp for google i guess.