Read Receipts offer a way for a message sender to know you have viewed their message, and vice versa. This can be a nice messaging feature in iOS, but it has obvious privacy implications and can become problematic in other situations. Fortunately the latest versions of iOS offer more granular controls and allow you to enable Read Receipts for individual contacts on a person by person basis, while still turning off all Read Receipts in Messages for iOS for everyone else. Or, conversely, you can enable Read Receipts for everyone, but turn the feature off for specific individual contacts too.
This is an excellent feature for iPhone and iPad users, and it’s easy to enable and to customize to specific contacts.