Messenger is a messenger app which helps us to manage facebook messages. It is an excellent app with no bugs, crashes at all.
It is used while chatting on Facebook. Also, it improved a lot with updates and now we can also use it to call and video calling.
It can also manages sim messages now. We can chat about it while using any application with the help of chat head feature though it is not available in windows. Personally, I had a great experience while using this app!