Why Do We Need Protocol In Computer Networks?

Ya, that is right. Since we need to communicate we need protocols. Now, the question is what is a network
protocol?  A network protocol defines rules and conventions for communication between network devices.
Network protocols include mechanisms for devices to identify and make connections with each other, as well as formatting rules that specify how data is packaged into messages sent and received.

Network Protocol
A Network Protocol defines rules and conventions for communication between network devices. Protocols for computer networking all generally use packet switching techniques to send and receive messages in the form of packets.

Need of Protocols in Computer Networks
Network protocols include mechanisms for devices to identify and make connections with each other, as well as formatting rules that specify how data is packaged into messages sent and received. Some protocols also support message acknowledgement and data compression designed for reliable and/or high-performance network communication. Hundreds of different computer network protocols have been developed each designed for specific purposes and environments.
You need protocols in computer networks because computer networks consist of devices and software made by many different vendors. The only way to ensure compatibility among them all is to have common documents (i.e. The protocol specifications) that describe the mechanics and formats of all the data exchanged over the network.

A network protocol defines rules and conventions for communication between network devices.
Network protocols include mechanisms for devices to identify and make connections with each other, as well as formatting rules that specify how data is packaged into messages sent and received.

Well, the short answer is, because we need to communicate,

Some of them are as ...

1. TCP.
2. IP
3. FTP.
4. DHCP.
5. BGP.
6. HTTP etc.

Because Protocols usually  routes the data where required

We need protocols in computer networks