OTPW stands for 'One Time Password' or 'One Time Passwords'. It is a way to make sure that when someone is logging into an account, like an email account, the person is really who they say they are. The way it works is that when someone tries to log in, they will be given a random string of numbers or letters that is unique to them. This code is only good for one login, so if someone else tries to log in with it, they won’t be able to. This way, only the person that was given the code can log in. OTPW makes it harder for someone to guess your password or for someone else to log in as you.