This is the 389th most frequent Estonian word.
vajalik
Necessary.
In this instance, 'vajalik' is used impersonally, stating the necessity of a certain action without attaching it to a specific subject.
On vajalik, et me kohtuksime enne koosolekut.
It is necessary that we meet before the meeting.
In this sentence, 'vajalik' is used to emphasize the tool's essential role in the specific context.
See tööriist on selle ülesande juures väga vajalik.
This tool is very necessary for accomplishing this task.
Here, 'vajalikud' (necessary) describes the books, indicating their importance for the activity mentioned.