WhatsApp Web is a feature provided by WhatsApp that allows you to use WhatsApp on your computer through a web browser. It serves as an extension of the WhatsApp app on your smartphone, mirroring your conversations and messages from your phone to the web interface. To use WhatsApp Web, you need to visit the official WhatsApp Web website on a supported web browser and whatsapp web scan a QR code with the WhatsApp app on your phone. 

To use WhatsApp Web on your computer web browser, follow these steps:

• Open a computer web browser (supported browsers include Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, or Opera).

• Visit the official WhatsApp Web website by typing in the URL: web.whatsapp.com.

• On the WhatsApp Web page, you will see a QR code displayed.

• On your smartphone, open the WhatsApp app.

• Tap on the menu icon (three vertical dots) located in the top right corner of the WhatsApp app.

• From the menu, select "WhatsApp Web" or "Linked Devices" (the exact wording may vary depending on your device).

• Tap on the option to "Scan QR Code" or a similar prompt to open the QR code scanner within the WhatsApp app.

• Align your phone's camera with the QR code displayed on the computer screen.

• Once the QR code is scanned successfully, your WhatsApp account will be linked to WhatsApp Web, and the web page will display your chats and conversations.

It's also important to note that WhatsApp Web is an extension of your WhatsApp account on your phone, so any actions taken on the web interface will be synced with your phone and vice versa.

You can initiate and participate in video calls using WhatsApp Web with the help of a mobile device. Here's how you can do it:

• Ensure that your smartphone, with the WhatsApp app installed, is connected to a stable internet connection.

• Open whatsapp web scan on your computer and scanning the QR code with your phone.

• Once logged in to WhatsApp Web, you can start a video call by following these steps:

  • Open an individual or group chat with the contact(s) you want to video call.

  • Click on the "Attach" icon (paperclip or clip icon) located at the top right corner of the chat window.

  • From the options that appear, click on the "Camera" icon to start a video call.

  • This action will trigger your phone's WhatsApp app to initiate the video call. The video call will be displayed on your phone, while WhatsApp Web will show a notification about the ongoing video call.

• Accept the video call on your phone by sliding the answer button or tapping the respective option.

• Once the video call is connected on your phone, you can continue the conversation using your phone's microphone and camera.

To add a contact in WhatsApp Web, you need to ensure that the contact's phone number is saved in your phone's contacts. Once the contact is saved on your phone, it will automatically appear in your WhatsApp Web contacts list. Here's how you can add a contact in WhatsApp Web:

• Open WhatsApp on your mobile device.

• Ensure that you have saved the contact's phone number in your phone's address book.

• Launch WhatsApp Web on your computer by visiting whatsapp web scan the QR code with your phone.

• Once logged in to WhatsApp Web, click on the chat icon (speech bubble icon) located in the top left corner of the screen.

• In the search bar at the top of the chat list, type the name or phone number of the contact you want to add.

• As you start typing, WhatsApp Web will display matching results based on your contacts. Click on the contact's name or phone number from the search results.

• WhatsApp Web will open a chat window for the selected contact if they are already using WhatsApp.

• If the contact is not using WhatsApp, you will see a prompt to invite them to join WhatsApp.