macOS Sierra: Screen sharing overview
Use built-in screen sharing to connect to another Mac on your network and display its screen on your Mac. You can use screen sharing to access your Mac while you’re away, solve a problem on someone else’s Mac, or collaborate with others on a project such as a website or presentation.
If you have an iCloud account, you can use Back to My Mac to share the screen of a Mac on a remote network.
For additional remote management capabilities, such as installing and configuring apps, helping remote users, and creating detailed reports, you can purchase Apple Remote Desktop from the App Store. Apple Remote Desktop is used to remotely manage Mac computers in a commercial or business environment.
Screen sharing and Remote Desktop screen sharing are compatible with Virtual Network Computing (VNC), an industry standard for controlling computers remotely on a network using TCP/IP.