WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc. it allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media. WhatsApp's client application runs on mobile devices but is also accessible from desktop computers, as long as the user's mobile device remains connected to the Internet while they use the desktop app. The service requires users to provide a standard cellular mobile number for registering with the service. In January 2018, WhatsApp released a standalone business app targeted at small business owners, called WhatsApp Business, to allow companies to communicate with customers who use the standard WhatsApp client. (according to Wikipedia)
With WhatsApp, you'll get fast, simple, secure messaging and calling for free, available on phones all over the world.
WhatsApp Business App
WhatsApp Business is a free to download app that was built with the small business owner in mind. Create a catalog to showcase your products and services. Connect with your customers easily by using tools to automate, sort and quickly respond to messages.
WhatsApp can also help medium and large businesses provide customer support and deliver important notifications to customers. Learn more about WhatsApp Business API.
Below Are WhatsApp Web Features
TEXTS (WhatsApp App Web)
Simple, Reliable Messaging
Message your friends and family for free*. WhatsApp uses your phone's Internet connection to send messages so you can avoid SMS fees.
* Data charges may apply. Contact your provider for details.
Checkout: ERR_CACHE_MISS
GROUP CHAT (Whats App Web)
Groups to keep in touch.
Keep in touch with the groups of people that matter the most, like your family or coworkers. With group chats, you can share messages, photos, and videos with up to 256 people at once. You can also name your group, mute or customize notifications, and more.
WHATSAPP ON WEB AND DESKTOP
Keep the Conversation Going
With WhatsApp on the web and desktop, you can seamlessly sync all of your chats to your computer so that you can chat on whatever device is most convenient for you. Download the desktop app or visit web.whatsapp.com to get started.
WHATSAPP VOICE AND VIDEO CALLS
Speak Freely (whats App Web)
With voice calls, you can talk to your friends and family for free, even if they're in another country. And with free video calls, you can have face-to-face conversations for when voice or text just isn't enough. WhatsApp voice and video calls use your phone's Internet connection, instead of your cell plan's voice minutes, so you don't have to worry about expensive calling charges.
* Data charges may apply. Contact your provider for details.
END-TO-END ENCRYPTION
Security by Default (WhatsApp Web).
Some of your most personal moments are shared on WhatsApp, which is why we built end-to-end encryption into the latest versions of our app. When end-to-end encrypted, your messages and calls are secured so only you and the person you're communicating with can read or listen to them, and nobody in between, not even WhatsApp.
PHOTOS AND VIDEOS (What's App Web)
Share Moments that Matter.
Send photos and videos on WhatsApp instantly. You can even capture the moments that matter to you most with a built-in camera. With WhatsApp, photos and videos send quickly even if you're on a slow connection.
VOICE MESSAGES (WhatsApp Web)
Say What's On Your Mind.
Sometimes, your voice says it all. With just one tap you can record a Voice Message, perfect for a quick hello or a longer story.
DOCUMENTS (What's App Web)
Document Sharing Made Easy
Send PDFs, documents, spreadsheets, slideshows and more, without the hassle of email or file sharing apps. You can send documents up to 100 MB, so it's easy to get what you need over to who you want.
Source: https://www.whatsapp.com/
How to use WhatsApp Web or connect phone WhatsApp to PC or computers
1.) Get the desktop App on WhatsApp.com/download2.) Open the Desktop App on your computer.
3.) Choose WhatsApp web on your phone.
4.) Scan QR code in link to your account.
5.) You're all set to go. Like and Share
Source: WhatsApp Web; How to use on PC/Desktop