La etiqueta de envío tiene el número de seguimiento.

Because Spanish nouns have grammatical gender.

• etiqueta is feminine, so it uses la
• número is masculine, so it uses el

This does not mean the objects themselves are feminine or masculine in a real-world sense. It is just part of how Spanish grammar works, and articles and adjectives have to match the noun.

De envío is a noun phrase that describes what kind of label it is.

• etiqueta = label
• de envío = for shipping / shipping-related

So etiqueta de envío means shipping label.

Spanish very often uses noun + de + noun where English might use two nouns together. English says shipping label; Spanish prefers etiqueta de envío.

Here, envío is a noun.

In this sentence, de envío means something like of shipping or for shipment, so envío is not functioning as the verb I send.

That can be confusing because envío can also be a verb form of enviar. But after de, in this sentence, it is clearly a noun.

Because the subject is la etiqueta de envío, and the sentence is saying that the label has the tracking number.

• tiene = has
• hay = there is / there are

So:

• La etiqueta de envío tiene el número de seguimiento = the shipping label has the tracking number
• Hay un número de seguimiento en la etiqueta de envío = there is a tracking number on the shipping label

Both are possible, but they are structured differently.

Using el makes it sound like a specific, identifiable tracking number, not just any tracking number.

Spanish often uses the definite article when both speaker and listener are understood to know which thing is being referred to. In this context, a shipment normally has a particular tracking number, so el número de seguimiento is very natural.

If you said un número de seguimiento, it would sound more like a tracking number, introducing the idea more generally.

It is another noun + de + noun structure.

• número = number
• seguimiento = tracking / follow-up

So número de seguimiento means tracking number.

This is a very common Spanish pattern:

• número de teléfono = phone number
• tarjeta de crédito = credit card
• etiqueta de envío = shipping label

English often puts the first noun directly in front of the second one, but Spanish usually connects them with de.

Good question. De envío and del envío do not mean exactly the same thing.

• etiqueta de envío = shipping label, a label used for shipping
• etiqueta del envío = the label of the shipment, meaning the label belonging to a specific shipment

So in your sentence, de envío is being used to classify the type of label. It is not talking about the shipment as a specific owner.

Yes, but the emphasis may change.

The original sentence is natural:

• La etiqueta de envío tiene el número de seguimiento.

You could also say:

• El número de seguimiento está en la etiqueta de envío.

That version focuses more on where the tracking number is.

So both are correct, but they are not identical in emphasis:

• tiene focuses on what the label contains
• está en focuses on location

They show which syllable is stressed.

• envío → stress on ví
• número → stress on nú

This matters for pronunciation.

Also, in envío, the accent helps show that í and o are pronounced in separate syllables: en-ví-o.

And número is stressed on the third-to-last syllable, and words with that stress pattern always take a written accent in Spanish.

No. Seguimiento is very common and widely understood, but some regions may also use other expressions, such as:

• número de rastreo
• código de rastreo
• sometimes simply guía, depending on the country and shipping context

Still, número de seguimiento is standard and very natural across much of the Spanish-speaking world.

It is very common and easy to understand. However, depending on the country or the shipping company, you may also see other terms, such as:

• guía de envío
• etiqueta
• guía

In many practical situations, people will understand etiqueta de envío perfectly well, even if another local term is also common.

Yes. That sounds very natural too.

• tiene = has
• incluye = includes

Both work well here.
Incluye can sound a little more formal or informational, while tiene is simpler and more everyday.

So all of these are possible:

• La etiqueta de envío tiene el número de seguimiento.
• La etiqueta de envío incluye el número de seguimiento.
• El número de seguimiento está en la etiqueta de envío.

They all communicate nearly the same basic idea, with slight differences in focus or style.