Individual Read Receipts
On iOS 9 you have the option to send read receipts to let someone know that you read what they sent. It is a very handy feature with some users, but it can be a pain for users who always want to know what your response is.
With iOS 10 you can go into each conversation and choose if you want to send read receipts. This is an amazing feature that we will certainly start using.
The rest of the conversations follow your default setting, so you can turn this on or off as you need it to handle your boss, parents or whoever really needs to know what is going on.