Authentication standards have been developed over time to ensure that systems can work with other systems without problems. The most common way to authenticate a user is through passwords. A password is a string of characters that must be entered correctly in order for the user to access the system. If a user enters their password incorrectly, it will fail and prevent them from logging on or accessing the system. I have contacted the essay writers uk through www.essayontime.co.uk/ website and they are agree to write my research paper on time at low rates so I am very excited about it.