sign in vs sign up

[adullstudent]

hi.what is the difference between sign in and sign up?

thank you.

[DavyBCN]

hi.what is the difference between sign in and sign up?
thank you.

Sign in is what you do when you enter a hotel, a meeting or another situation where people want a record of the visitors.

Sign up is when you join something, such as a club, or if you sign your name on a petition, although in the latter case sign up to is also common.

[river]

hi.what is the difference between sign in and sign up?
thank you.

See here http://www.usingenglish.com/referenc...l-verbs/s.html