Il cuoio richiede il lucido da scarpe.

In Italian, the definite article is often used for things spoken of in a general sense.

So il cuoio here means leather as a material in general, not one specific piece of leather.

This is very common in Italian:

• Il vino rosso si serve a temperatura ambiente.
• Il latte fa bene ai bambini.
• Il cuoio richiede il lucido da scarpe.

English often drops the article in this kind of statement, but Italian usually keeps it.

Cuoio means leather, especially the processed material made from animal skin.

It is related to pelle, but they are not always interchangeable:

• pelle = skin or hide, and also leather in some contexts
• cuoio = leather, often with a stronger sense of the finished, treated material

So if you are talking about leather shoes, belts, soles, or leather care, cuoio is very natural.

Richiede is the third-person singular present tense of richiedere.

The subject is il cuoio, which is singular, so the verb must also be singular:

• il cuoio richiede = leather requires
• le scarpe richiedono = the shoes require

So the form changes to match the subject.

A quick breakdown:

• richiedere = to require
• richiedo = I require
• richiedi = you require
• richiede = he/she/it requires

It can often be understood as to require, to call for, or sometimes to need, depending on context.

In this sentence, richiede suggests that leather needs a certain kind of care or treatment. It sounds a bit more formal or descriptive than simply saying ha bisogno di.

Compare:

• Il cuoio richiede il lucido da scarpe.
  = Leather requires shoe polish.

• Il cuoio ha bisogno del lucido da scarpe.
  = Leather needs shoe polish.

Both are understandable, but richiede sounds a little more like a general statement or recommendation.

For the same general reason as with il cuoio: Italian often uses the definite article when talking about something as a class, substance, or general item.

So il lucido da scarpe means shoe polish in general, not necessarily one specific tin or bottle.

English often says:

• Leather requires shoe polish.

Italian naturally says:

• Il cuoio richiede il lucido da scarpe.

This use of the article is very common with products, materials, and abstract/general nouns.

Here da means something like for or used for.

So:

• lucido da scarpe = polish for shoes = shoe polish

This is a very common Italian pattern:

• spazzolino da denti = toothbrush
• crema da barba = shaving cream
• macchina da scrivere = typewriter
• scarpe da tennis = tennis shoes

So noun + da + noun often tells you the purpose or use of something.

Because the expression means polish for shoes in a general sense.

Italian often uses the plural in these fixed-purpose expressions when the thing is normally thought of as a pair or as a category:

• lucido da scarpe = shoe polish
• literally, polish for shoes

Even though English often uses a singular noun in compounds like shoe polish, Italian does not always match that pattern directly.

Because after da in this kind of expression, Italian usually uses the noun without an article.

So you say:

• lucido da scarpe
• spazzolino da denti
• crema da barba

not:

• lucido da le scarpe
• spazzolino da i denti

This is just how the structure works when da means for / intended for.

It is grammatical and understandable, but in everyday conversation a native speaker might choose a slightly different wording depending on the context.

Possible alternatives:

• Il cuoio ha bisogno del lucido da scarpe.
• Le scarpe di cuoio vanno lucidate.
• Per il cuoio ci vuole il lucido da scarpe.

Your sentence sounds a bit like a general rule or instructional statement, which is perfectly fine.

It is pronounced approximately KWOH-yo.

A helpful breakdown is:

• cuo- = sounds like kwo
• -io = sounds like yo

So: cuoio → KWOH-yo

This word can feel awkward at first because of the vowel combination, but it becomes easier with practice.