For the first time, WhatsApp has introduced the web version, which means you will have the ability to use WhatsApp on your web browser.
Basically the web version is simply an extension of your phone. The web browser mirrors conversations and messages from your mobile device, this means all of your messages still live on your phone.
To connect your web browser to your WhatsApp client, open WhatsApp's website in your Google Chrome browser. You will see a QR code (scan the code inside of WhatsApp), and you're ready to go. You have now paired WhatsApp on your phone with the WhatsApp web client.
However, your phone needs to stay connected to the internet for the web version to work, and please make sure to install the latest version of WhatsApp on your phone. Unfortunately for now, the service is currently unavailable to iOS users due to Apple platform limitations.