春联属于楹联的一种，是一种独特的文学形式。它以工整、对偶、简洁、精巧的文字描绘时代背景，抒发美好愿望，表达了人们对于春节的美好期待和祝福！

A couplet must adhere to the following rules:

Both lines must have the same number of Chinese characters.
The lexical category of each character must be the same as its corresponding character.
The tone pattern of one line must be the inverse of the other. This generally means if one character is of the level (平) tone, its corresponding character in the other line must be of an oblique (仄) tone, and vice versa.
The last character of the first line should be of an oblique tone, which forces the last character of the second line to be of a level tone.
The meaning of the two lines need to be related, with each pair of corresponding characters having related meanings too.