1)Telegram-- is a free instant messaging application can be used for sending large files

2)Google products--Includes many applications like google docs,sheets,excel etc
                  helps teams to work together
                  No need need of sending files
                  Can be used in any device 

3)Zoom--Helps people connect to eachother easily

4)SmartWatches--Helps people notify the calls and messgaes they receive
             Some even helps to understand their health status not accurately though
          
5)Flipkart--Help people buy things sitting at home itself





Prepare a list of 5 functional/non-functional requirements for
 any one mobile app on your phones
WhatsApp

Functional Req

1)User needs to enter his/her phone number and rejister 
2)Add peple to the contacts who are using the application
3)User can set a profile pic ,about and status
4)Send messages,photos or videos 
5)One can see the status of the message sent

Non functional Req

1)Many users being able to use it at a given point of time
2)The privacy and security of the users 
3)Performance must be good
4)Less memory space should be used

WhatsApp

Functional Req

1)User must enter his/her phone number to rejister to the app
2)User can add the contacts who are using the app
3)User can set a profile picture and about
4)User can update status(Photo ,video)
5)User can send  messages and attachments(Photos,Videos,contacts,docs etc)
6)User can  see the status of the message or attachment sent 
7)User can backup the chat history


Non-Functionl Req

1)Around 1 billion users must be able to use the app at a given point of time
2)The personal conversations are protected by end to end encryption(256 bit Aes)
3)Less memory of the phone storage should be used(17 Mb)
4)Chat backup option around 10 gb space can be provided