You cannot let others sign for you as your representative.

Signing in refers to signing or writing the word "arrive" on the prescribed book to indicate that one has arrived. That is, recording oneself to show that one has attended or participated in an event. Mostly used for attending meetings or going to work. Only in this way can we ensure fairness to those who arrive.

There are many ways to sign in. The simpler way is to sign with paper and pen. For example, the teacher in school asks students to sign to count the number of people available. There are many electronic sign-in methods. Punch-in at work is another form of sign-in to prove a day's work. Some websites and forums also have check-in areas, which prove that you have been to the forum and increase the number of clicks on the forum. QR codes and facial recognition sign-ins are also used to record guests.