Although they are all over the Internet, but the answers are not fixed and were not asked all 4s at a time causing me to be confused.  Is it accurate if I say:   both login and sign in are the same as authenticate verb, to validate the user. Otherwise password are not required. both logout and sign out are the same log in is to authenticate into a website that has different interface as guest You cannot use the logged in interface if you are a guest, e.g. Facebook sign in is to authenticate into a website that has same interface as guest You can still use the website without signing in, e.g. Google register is entering your information into the system for your account for serious thing You need to enter your information like name, address, contact number, etc for domain registration. Another example is company registration. sign up is to create an account to use You only need to enter essential information like email, username, password, etc for a Facebook account.
I didn't find the difference between them by  googling  Edit: Thx litterally, authenticate, means prove its identity, which is a just a subprocess of global access authorization btw I forgot to mention "Sign In", that's another confusing term for me ;)  Edit 2 other useful answers:
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