# Data Communication in Computer Networks

Data communication is the exchange of data between two nodes via some form of link (transmission medium) such as cable.

 

  **Data flow**

  - it means nodes are going to exchange the data.

  - data is going to flow from one node to another node

  - there are 3 forms of data flows.

    1. Simplex
    2. Half duplex
    3. Full duplex

 **Simplex**

    - In simplex data flows, communication is always unidirectional.

    - One device can transmit and other devices will receive the data.

      *example*s: keyboard, traditional monitors, etc.

     ![simplex in computer networks ](https://cdn.hashnode.com/res/hashnode/image/upload/v1667326524395/ynHicVvzT.png align="center")

 **Half duplex**
- In a half-duplex, communication is in both directions but not simultaneously.
- If one device is sending, the other devices can only receive the data at the same time & vice versa.
*ex*: walkies-talkies


![duplex in computer networks ](https://cdn.hashnode.com/res/hashnode/image/upload/v1667326922172/3-WtL7yOQ.png align="center")

  **Full duplex** 

- It is also known as a Duplex.

- Communication is in both directions simultaneously.

- Devices can send or receive the data at the same time.

  *ex*: Phone call i.e we can talk and listen to the voice at the same time.


![full duplex in computer network ](https://cdn.hashnode.com/res/hashnode/image/upload/v1667327042981/MsnG5rDn6.png align="left")

Thanks for reading.

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