Your WeChat day in China:

You get up in the morning, use WeChat to order your breakfast, which is delivered to your door. Then you start to promote your products that you sell on wechat, mostly on the wall and in some chat groups. You will use WeChat to call your customers and they will pay you on WeChat. Later you need to visit a supplier and use WeChat to call your taxi. On the way you use the WeChat to send some messages and do some calles with WeChat, you basically don't call over the mobile network anymore, you only use WeChat. At your supplier you will take some pictures of the new products and immediately upload them to the WeChat wall. Later your supplier invites you out to eat. After dinner he pays with WeChat. To get the invoice he uses WeChat to scan the QR code and receives the invoice in WeChat.

Your WeChat day in China:

You get up in the morning, use WeChat to order your breakfast, which is delivered to your door. Then you start to promote your products that you sell on wechat, mostly on the wall and in some chat groups. You will use WeChat to call your customers and they will pay you on WeChat. Later you need to visit a supplier and use WeChat to call your taxi. On the way you use the WeChat to send some messages and do some calles with WeChat, you basically don't call over the mobile network anymore, you only use WeChat. At your supplier you will take some pictures of the new products and immediately upload them to the WeChat wall. Later your supplier invites you out to eat. After dinner he pays with WeChat. To get the invoice he uses WeChat to scan the QR code and receives the invoice in WeChat.

it's a chatting app/social network app that you can pay for stuff with (WeChat Wallet). It's used for business almost as much as regular social networking in China. So if you are using it regularly, you might be talking to Grandma with it in one chat, ordering food in another chat, and talking to a chinese factory/business in another chat.