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Spanish verbs have three different endings. "ar" "er" 'ir".

"necesitar" - "to need" is an "ar" verb, which is conjugated differently

than the "ir" and "er" verbs, but not very important to understand

how to do that right now. You will learn that along the way.

In this lesson, it is important to remember that:
"yo necesito - I need" can either be said with or without the pronoun "yo".
"¿Necesitas tú? - Do you need?" can be said with or without the pronoun "tú".
for example:

Necesito una chaqueta. - I need a jacket.

¿Necesitas una chaqueta? - Do you need a jacket?

If you were telling someone that they needed something you would say:

Tú necesitas una chaqueta. - You need a jacket.

(I switched the pronoun to the front of "necesitas" and changed the intonation

of my voice to a statement.). or you can just leave out the pronoun "tú" and

simply keep the intonation as a statement and say,

"Necesitas una chaqueta." - You need a jacket.

and the way you ask the question is

¿Necesitas una chaqueta?, but you say it as a question.

él necesita - "he needs" can be said with or without the pronoun "él".
"ella necesita - "she needs" can be said with or without the pronoun "ella".
"usted(ud.) necesita - "you need" can be said with or without the pronoun "usted(ud.)".

"nosotros necesitamos - "we need" can be said with or without the pronoun "nosotros".

"éllos necesitan - they(m) need" can be said with or without the pronoun "éllos".
"ellas necesitan - they(f) need" can be said with or without the pronoun "ellas".
"Ustedes necesitan - you need" (pl) can be said with or without the pronoun "ustedes(uds.)".

yo, tú, él, ella, usted, nosotros, éllos, ellas and ustedes are called "pronouns".

I think it's a good idea to use the pronouns in front of the verb while you are beginning to learn. Once you get better and more comfortable with verbs and the understanding of the pronouns, then take off the pronoun and just use the verb itself. But do what feels comfortable.

For example: "Yo necesito la llave." - "I need the key.". (with the pronoun)
"Necesito la llave." - "I need the key." (without the pronoun)

¿Necesitas tú la llave? - Do you need the key? (with the pronoun)
¿Necesitas la llave? - Do you need the key? (without the pronoun)

The verb "necesitaot; has three pronouns. "él, ella and usted" - "he, she and you(formal)
él necesita - he needs
ella necesita - she needs
usted necesita - you need (one person, formal)

Él necesita un coche nuevo. - He needs a new car. but the pronoun "él" is not necessary. 
"Necesita un coche nuevo." - He needs a new car.

and if you change the intonation of your voice to a question you can ask,

¿Necesita un coche nuevo? - Does he need a new car? 
¿Necesita un coche nuevo? - Does she need a new car?

If you don't speak the pronoun and just speak the verb "necesita" the only way you know how the speaker is using the verb "necesita" is through the context of the conversation that you are speaking or writing. 

For example: If you are talking about "Jack" and then say in the conversation, "He needs a new car.", then you already know you are talking about a boy, so when you say "necesita' you know you are using the verb "necesita" as "he needs".

If you are speaking about Josephine in a conversation and then it is said, "She needs a new television.", then you know you are talking about a girl and when you say, "necesita" you know you are using the verb "necesita" as"she needs"

but if you just started the conversation and don't use a pronoun and say, "Necesita un coche nuevo." I wouldn't know whom you were speaking about nor would I know if it was a girl or boy, but if you said, "Jack necesita un coche nuevo.", then I know we are speaking about Jack and everytime you say, "necesita" I would already know that we are using the verb "necesita" as "he needs."

There are three pronouns with the verb "necesitan" "éllos, ellas and ustedes" - they(m) they(f) and you((pl)formal)

éllos necesitan - they need (masculine)
ellas necesitan - they need (feminine)
Ustedes necesitan - you need (many people, formal)


For example: "Éllos necesitan los llaves. - They(m) need the keys." 
" Necesitan los llaves. - They(m) need the keys."

"Ellas necesitan los llaves. - They(f) need the keys." 
" Necesitan los llaves. - They(f) need the keys."

"Ustedes necesitan los llaves. - You (all of you formal) need the keys." 
" Necesitan los llaves. - You (many people, formal) need the keys."


If you are speaking about boys and girls together you use the pronoun "ellos". 
If they(girls and boys) need the books, then you say "Ellos necesitan los libros. - They need the books.".