The size of the paper is about the same size as the usual paper. Our common ones are: A5, A4, B5, etc. Different sizes are of different use for different users. For example, A5 and B5 size lap paper can be used to take notes, and smaller size lap paper can be placed on the desktop to make sticky notes.
Nowadays, with the rapid development of the Internet, few of us will think of picking up a pen and writing a letter on stationery and sending it to distant relatives and friends, and the role of taking paper has gradually become a notepad.