Hi , what is the difference between router and bridge ?

bridge - crosschain swap?

And router ?

onchain

Is their is any other difference ?

Yes, bridges use some offchain software to detect and send funds in another network

Brother, can you refer any documentation, i want to know more about it

https://medium.com/coinmonks/how-do-cross-chain-bridges-work-a-case-on-wormhole-part-1-37c8de2cf2e4

and other parts

Thankyou brother