This is the 196th most frequent German word.
wichtig
Important.
Here, 'wichtig' is used as an adjective to express that something is of importance or significance.
Es ist wichtig, dass du genug Schlaf bekommst.
It is important that you get enough sleep.
In this sentence, 'wichtiges' is the adjective form describing the noun 'Dokument' to indicate its significance.
Ein wichtiges Dokument liegt auf dem Tisch.
An important document is lying on the table.
This usage of 'wichtig' conveys the importance or value of preparation, emphasizing its necessity.