Here's why:
* Transitive verbs require a direct object to complete their meaning. They act on something or someone.
Examples:
* I need a new car. (The direct object is "a new car")
* We need more time. (The direct object is "more time")
"Need" can also be used as an auxiliary verb (helping verb), forming a modal verb construction.
Examples:
* I need to study for the test. ("Need to" is a modal verb expressing necessity)
* You need not worry. ("Need not" is a modal verb expressing lack of necessity)
Therefore, the type of verb "need" is depends on its context and usage in the sentence.