Он вышел наружу.

Вышел is the masculine singular past-tense form of выйти, which means to go out / to come out / to exit.

Breakdown:

• вы- = a prefix often giving the idea of out
• йти = an old motion root related to to go

So выйти is basically to go out. In the sentence, вышел means went out / came out.

In Russian, the past tense is usually formed with -л plus gender/number endings.

For выйти, the past forms are:

• он вышел = he went out
• она вышла = she went out
• оно вышло = it went out
• они вышли = they went out

So the -л is a normal past-tense marker, and the full form вышел shows that the subject is masculine singular.

Russian often includes the subject pronoun when it is useful or natural, but it can also be omitted if the subject is already clear from context.

So both can work:

• Он вышел наружу.
• Вышел наружу. — if it is already obvious who did it

Including он makes the subject explicit: he.

This is a classic Russian aspect pair:

• выйти = perfective
• выходить = imperfective

In this sentence, вышел is perfective, so it presents the action as a completed event: he went out, and that action happened as a whole.

Compare:

• Он вышел наружу. = a completed action
• Он выходил наружу. = he used to go outside / he went outside for a while / he was going outside, depending on context

A native English speaker often notices that Russian cares a lot about whether an action is seen as complete or ongoing/repeated.

Наружу means outward / outside / to the outside, and it is used with motion.

It answers the question where to? rather than where?

So:

• наружу = movement toward the outside
• снаружи = outside, on the outside, location rather than direction

That is why Он вышел наружу sounds natural: the verb describes movement, and наружу gives the direction.

Because вышел describes motion from inside to outside.

Russian often distinguishes:

• куда? = where to? → direction
• где? = where? → location

So:

• Он вышел наружу. = He went out / moved outside
• Он стоял снаружи. = He was standing outside

A good shortcut:

• наружу = directional
• снаружи = locational

For practical learning purposes, treat наружу as an adverb meaning outside / outward in the sense of direction.

Historically, forms like this come from older case forms, but in modern Russian it is best learned as a fixed adverb. You do not normally decline it like a regular noun.

So in this sentence, наружу is not functioning like an ordinary noun phrase such as на улицу. It is simply an adverb telling you the direction of movement.

Yes. Он вышел is a complete sentence.

Adding наружу makes the direction more explicit. Depending on context:

• Он вышел. = He went out / he left
• Он вышел наружу. = He went outside / out into the open

So наружу adds emphasis to the idea of moving to the outside.

They are close, but not identical.

• наружу = outside, outward, out into the open
• на улицу = onto the street / outside specifically to the street

So на улицу is more concrete and specific. Наружу is more general.

Examples:

• Он вышел наружу. = He went outside.
• Он вышел на улицу. = He went out onto the street.

In many contexts they may both be acceptable, but на улицу gives a more specific destination.

Yes. Russian word order is flexible, though different orders change emphasis.

Neutral order:

• Он вышел наружу.

Other possible orders:

• Наружу он вышел. — emphasizes outside
• Вышел он наружу. — can sound more narrative, contrastive, or stylistically marked depending on context

For a learner, Он вышел наружу is the safest and most neutral version.

A simple pronunciation guide:

• вышел = VY-shel
  Stress on the first syllable: вЫшел

• наружу = na-ROO-zhu
  Stress on the second syllable: нарУжу

So the full sentence is pronounced roughly: Он ВЫшел нарУжу.

Also note:

• о in unstressed positions is often pronounced closer to a
• ж sounds like the s in measure

Yes, it is normal and understandable, but in everyday speech Russians often simply say вышел if the context already makes outside obvious.

For example, if someone was inside a building, room, or house, Он вышел may already imply he went out.

Using наружу is still correct and natural, especially when you want to stress the direction from inside to outside.

Not necessarily. Historically and basically, идти / выйти are verbs of motion associated with going on foot, but in real usage выйти is often used more broadly for exit / come out / step out.

For example, a person can:

• выйти из дома = leave the house
• выйти из машины = get out of the car
• выйти наружу = go outside

So in this sentence, do not over-focus on walking specifically. The key idea is exiting to the outside.