Ssh into ubuntu server

Is it necessary to ssh even if i am using ubuntu as my os

Hey, Yes it is necessary even if you are using ubuntu as your os. The ssh command provides a secure encrypted connection between two hosts over an insecure network. This connection can also be used for terminal access, file transfers, and for tunneling other applications.

How do I enable ssh on ubuntu? When i try to enable ssh, and use the command “ssh root@ip_address”, it returns: “ssh:connect to host ip_address port 22: Network is unreachable”
When i check ssh status using “sudo service ssh status” it returns that its active and running.
Please help me use ssh on ubuntu OS.