Question

Present day communication system are

Answer 1

telecommunication
optical communication
fibre-optic communication
radio communication
power line communication
duplex communication
tactical communication
defense communication systems and etc...

Answer 2

hey
here is ur answer,
Present day communication system are,
1)Cellular Phones
2)Skype
3)Instant Messaging
4)Twitter
5)Email
etc...

I hope it will help u☺️☺️☺️☺️