that you could use to automatic validate inputs that you want to have a mandatory characters, size, etc. Also could be used to create a index in our mobile apps, if the ID of local DB isn't enough to your app. 

That's the characters used by this generator: !@#$%¨&*()-_=+ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789