This is the 132nd most frequent Russian word.
необходимо
Necessary.
Usage denotes an impersonal construction emphasizing the necessity of the action.
Необходимо завершить это задание до завтрашнего дня.
It is necessary to complete this task by tomorrow.
Expresses an undeniable requirement needed for success.
Чтобы достичь успеха, необходимо приложить усилия.
To achieve success, it is essential to make an effort.
Indicates a required action in response to a specific context.