What does "check in" mean?

Generally refers to check-in, which means there is no absence from work. It can be said to be about love or work.

When staff go to and from get off work, they put their time cards on the magnetic card machine and record the time they arrive and leave the unit, which is called clocking in. It can be understood as "register, show your certificate", or "please pay, please check out" and so on.

Extended information:

"Card" is a very common thing in modern society. Credit cards, shopping cards, bus cards, bank cards, membership cards, etc., appear subsequently. There is a saying of "checking in", with smooth pronunciation and concise semantics.

Card punching machines: mainly divided into three categories: magnetic cards, barcode cards, and IC cards. At present, the most widely used ones are magnetic card and barcode card attendance machines. The main feature is to use a computer to summarize the original data, and finally print out the report through a printer, making the query method more convenient. But the price is on the high side and operation is cumbersome. It is generally suitable for units with a large number of employees and regular work and rest hours.

IC card attendance machine is a new model that has just emerged in recent times. Its main advantages are easy to use, low price, and one-card implementation in many units, which means it can be connected to telephone and meal vending systems.

Reference material: Check-in-Baidu Encyclopedia