Why do we use Subneting in a Network?

Subnetting allows you to cut your subnet down to even smaller portions which mean you can conserve huge amounts of wasted addresses.

Subnetting allows you to create multiple logical networks that exist within a single Class A, B, or C network. If you do not subnet, you are only able to use one network from your Class A, B, or C network, which is unrealistic.

-in case of broadcast , the subneting is very useful , instant of broadcasting to the whole number of pcs , you can just broadcast to a small group of subnet.
-in case of configuration, if you want to allow a certain , privileges , to some network pcs , you can group them in the same subnet.

thanks and sorry for me english

Subneting is a process of creating a multiple network by using a single network.
Subneting is use to save the ip address
Example:
Suppose i hva small office , which i need 10 Public ip.
For 10 ip, the entire network is wastage