El embalaje protege el contenido.

Because both embalaje and contenido are masculine singular nouns.

• el embalaje = the packaging
• el contenido = the content / the contents

In Spanish, nouns usually need an article like el, la, un, or una when you are talking about them in a general or specific way. Here, both are presented as definite things: the packaging and the contents/content.

Embalaje is simply a masculine noun, so it takes el.

A useful pattern: many nouns ending in -aje are masculine:

• el viaje = the trip
• el paisaje = the landscape
• el mensaje = the message
• el embalaje = the packaging

So even though -e endings do not always clearly show gender, -aje words are very commonly masculine.

Not exactly. Embalaje usually means packaging, packing, or packing material, rather than a single package.

So:

• embalaje = packaging / packing
• paquete = package / parcel
• caja = box

In Latin American Spanish, you may also hear empaque, which can overlap with embalaje in many contexts.

Very roughly:

• El embalaje protege el contenido = the packaging protects the contents
• El paquete llegó hoy = the package arrived today

Because protege is a conjugated verb, while proteger is the infinitive.

The subject is el embalaje, which is third person singular, so the verb must match it:

• proteger = to protect
• protejo = I protect
• proteges = you protect
• protege = he/she/it protects

So in this sentence:

• El embalaje protege... = The packaging protects...

The verb helps you. In El embalaje protege el contenido, the thing doing the action is el embalaje, so it is the subject. The thing receiving the action is el contenido, so it is the direct object.

A simple way to test it:

• What protects? → El embalaje
• What is protected? → El contenido

So:

• subject: el embalaje
• verb: protege
• direct object: el contenido

Because the personal a is generally used with specific people (and sometimes pets or personified beings), not with things.

Compare:

• Veo el contenido. = I see the content.
• Veo a María. = I see María.

Since contenido is a thing, not a person, there is no a.

It can correspond to either one in English, depending on context.

In Spanish, el contenido is often a singular collective noun, even when English might naturally say the contents.

So this sentence could be understood as:

• the packaging protects the content
• the packaging protects the contents

Both are possible in English depending on the situation.

In most of Latin America, protege is pronounced roughly like:

pro-TE-he

More specifically:

• pro = like pro
• te = like teh
• ge = the g before e sounds like a strong English h

So protege sounds approximately like:

pro-TE-he

Also, the stress falls on te: pro-TE-ge.

Because in Spanish, g changes sound depending on the vowel that follows it.

• before a, o, u: a hard g sound
  
  • gato, gota, gusano
• before e, i: a throaty sound, similar to an English h in much of Latin America
  
  • gente, girar, protege

So in protege, the ge is not like English gee. It is pronounced more like he.

Yes. In much of Latin America, empaque is very common and can often be used in a similar way.

• embalaje often sounds a bit more formal or technical
• empaque is often very natural in everyday and commercial contexts

So both can work, depending on region and context:

• El embalaje protege el contenido.
• El empaque protege el contenido.

The exact nuance can vary by country and industry.

Because the sentence is talking about packaging as a whole and content/contents as a whole.

Spanish often uses the singular for general concepts:

• El embalaje = packaging in general / the packaging
• El contenido = the content / the contents

If you wanted to make things explicitly plural, you could, but it would slightly change the feel:

• Los embalajes protegen los contenidos.
  = The packages/packaging materials protect the contents.

The original sentence sounds more like a general statement, such as something you might read on a label, in instructions, or in product information.

Yes, but the original order is the most neutral and natural:

• El embalaje protege el contenido.

Spanish word order is fairly flexible, but changes in order often add emphasis or sound less neutral.

For example:

• El contenido lo protege el embalaje.

This is possible, but it is more marked and emphasizes el embalaje as the thing doing the protecting. A learner should usually stick with the basic pattern:

subject + verb + object

Often it behaves like an uncountable noun meaning packaging in general, especially in sentences like this one.

• El embalaje protege el contenido.

But in some contexts, people may talk about different types or units of packaging, especially in technical or commercial language.

For a learner, the safest idea is:

• embalaje usually works like packaging
• paquete works like package
• caja works like box

So if you mean the material or protective packing around something, embalaje is a good fit.

It is a simple present indicative sentence stating a fact or general truth.

Structure:

• El embalaje = subject
• protege = present tense verb
• el contenido = direct object

This kind of sentence is very common for:

• labels
• product descriptions
• technical writing
• general statements

It has the sense of The packaging protects the contents as a factual statement.