If Skype for Business came with your office 2016 or office 365 installation, you may find that it's almost impossible to either disable or remove it. The application will often launch with each start of Windows, even when explicitly configured not to do so.
Skype is for doing things together, whenever you’re apart. Skype’s text, voice and video make it simple to share experiences with the people that matter to you, wherever they are.
With Skype, you can share a story, celebrate a birthday, learn a language, hold a meeting, work with colleagues – just about anything you need to do together every day. You can use Skype on whatever works best for you - on your phone or computer or a TV with Skype on it. It is free to start using Skype - to speak, see and instant message other people on Skype for example.