El comparador de ofertas compara dos tarifas eléctricas.

Because they come from the same verb: comparar = to compare.

• comparador = comparer / comparator / comparison tool
• compara = he/she/it compares or you compare (usted)

So in this sentence:

• El comparador = the comparison tool / the comparator
• compara = compares

This kind of word family is very common in Spanish:

• hablar → habla
• trabajar → trabaja
• comparar → compara

The ending -dor often makes a noun meaning something or someone that does the action:

• aspirar → aspirador
• ordenar → ordenador (in Spain, computer)

El is the masculine singular definite article, meaning the.

It is used because comparador is a masculine singular noun:

• el comparador

Spanish uses articles more regularly than English, so where English might sometimes omit the, Spanish often keeps it.

Here it simply means:

• El comparador = The comparator / The comparison tool

Spanish often uses de + noun where English might use another noun as an adjective.

So:

• comparador de ofertas = literally comparator of offers
• natural English: offer comparator, offer comparison tool, or depending on context, deal comparison tool

This structure is very common:

• zapatos de deporte = sports shoes
• mesa de madera = wooden table
• comparador de precios = price comparison tool

So de ofertas tells you what kind of comparator it is: one for offers.

Because it means offers, in the plural.

The phrase comparador de ofertas refers to a tool that compares multiple offers in general, not just one specific offer.

Spanish often uses the plural in this kind of category phrase:

• tienda de ropa = clothing shop
• comparador de precios = price comparison tool
• buscador de vuelos = flight search engine

Using the plural here sounds natural because the tool is designed to compare different offers.

Because it is the third-person singular present tense of comparar.

Present tense of comparar:

• yo comparo
• tú comparas
• él/ella/usted compara
• nosotros comparamos
• vosotros comparáis
• ellos/ellas/ustedes comparan

The subject here is El comparador, which is third-person singular, so the verb must be compara.

Because Spanish usually does not need subject pronouns when the subject is already clear.

English says:

• It compares two electricity tariffs.

Spanish normally just says:

• Compara dos tarifas eléctricas.

Or, if the subject is stated:

• El comparador de ofertas compara dos tarifas eléctricas.

Since the noun El comparador de ofertas is already there, adding a pronoun like él would usually be unnecessary.

Because in Spanish, adjectives usually come after the noun.

So:

• tarifas eléctricas = electric tariffs / electricity rates

This is the normal order:

• coche rojo = red car
• casa grande = big house
• tarifas eléctricas = electric tariffs

Putting the adjective before the noun is possible in some cases, but it often changes the tone or meaning, and here it would sound unnatural.

Because adjectives in Spanish must agree with the noun they describe in gender and number.

Here, the noun is:

• tarifas = feminine plural

So the adjective must also be feminine plural:

• singular masculine: eléctrico
• singular feminine: eléctrica
• plural masculine: eléctricos
• plural feminine: eléctricas

That is why the sentence has:

• dos tarifas eléctricas

Because tarifa is a feminine noun in Spanish.

You usually learn the gender as part of the word:

• la tarifa
• las tarifas

That is why you get:

• dos tarifas eléctricas not
• dos tarifas eléctricos

There is not always a logical reason for noun gender, so it is best to memorize nouns together with their article:

• la tarifa
• el comparador

Because a is not used before a direct object unless it is the personal a.

The personal a is used mainly with specific people (and sometimes pets or personified beings), not with things.

Compare:

• Veo a María. = I see María.
• Veo dos tarifas eléctricas. = I see two electricity tariffs.

In your sentence, dos tarifas eléctricas is a thing, not a person, so there is no a.

Yes. In many real-life contexts, tarifas eléctricas can be translated in different ways depending on what sounds natural in English:

• electric tariffs
• electricity tariffs
• electricity rates
• energy tariffs (sometimes, depending on context)

The Spanish grammar stays the same either way:

• tarifas = rates / tariffs
• eléctricas = electrical / electric / electricity-related

So the exact English wording may vary, but the Spanish structure does not change.

A rough Spain Spanish pronunciation would be:

el kom-pa-ra-DOR de o-FER-tas kom-PA-ra dos ta-RI-fas e-LEK-tri-kas

A few useful notes:

• c before a, o, u sounds like k:
  • compara, comparador
• z and c before e, i are pronounced with the th sound in much of Spain, but that does not affect these particular words much because the relevant c here is before a:
  • eléctricas has c before a, so it sounds like k
• the written accent in eléctricas shows the stress:
  • e-LEC-tri-cas

The normal, neutral order is:

El comparador de ofertas compara dos tarifas eléctricas.

That is:

• subject
  • verb
    • object

You can change word order in Spanish for emphasis, but the basic sentence here is already the most natural one.

For example, you might hear:

• Dos tarifas eléctricas compara el comparador de ofertas.

But that sounds marked or literary, not like the standard everyday version. For a learner, the original order is the one to use.

In this sentence, it most likely refers to a tool, website, app, or system that compares offers.

Grammatically, though, comparador is just a noun meaning comparer/comparator, so in principle it could refer to something or someone that compares.

In modern everyday usage, especially in business or tech contexts, comparador de ofertas usually means a comparison tool or comparison website.