All are you know about Google no one can challenge it. A nice product by google or as you can say a nice service provided by google to us.
Google keep is very simple and genuine service.
In short it work as an sticky notes on google cloud it provide good user interface. anyone can understand easily. it will also provide sharing center in which you can share your notes to any other person. Also provide the facility to remind your notes.
You can also used in mobile the application are available on play store.