syouhin no miryoku wo setumeisita.

A natural reading is:

• 商品 = しょうひん
• の = の
• 魅力 = みりょく
• を = を (pronounced お in normal speech)
• 説明した = せつめいした

So the whole sentence is read:

しょうひん の みりょく を せつめいした。

の connects two nouns. Here it shows that 魅力 belongs to, relates to, or is about 商品.

So:

• 商品 = product / merchandise
• 魅力 = charm / appeal / attractive points
• 商品の魅力 = the product’s appeal / the appeal of the product

This is one of the most common uses of の: noun + の + noun.

Because the thing being directly acted on by 説明した is 商品の魅力 as one whole noun phrase.

The structure is:

• 商品の魅力 = the appeal of the product
• を = marks the direct object
• 説明した = explained

So the speaker explained the appeal of the product, not just the product itself.

In other words, 商品 is inside the noun phrase, and 魅力 is the head noun of that phrase.

Both are possible, but 説明した is more compact and very common.

Here is the difference:

• 説明した = explained
• 説明をした = did an explanation / gave an explanation

Since 説明 is a verbal noun, it can combine directly with する:

• 説明する
• past tense: 説明した

Japanese often prefers this shorter form.

説明した is the plain past form of 説明する.

So it means something like:

• explained
• did explain

It tells you the explanation happened in the past.

It does not automatically tell you:

• exactly when it happened
• whether it was completed recently or long ago
• who did it

Those things come from context.

The subject is omitted, which is extremely common in Japanese.

This sentence could mean:

• I explained the product’s appeal.
• He explained the product’s appeal.
• She explained the product’s appeal.
• They explained the product’s appeal.

Japanese often leaves out information that is already clear from context. So if the speaker, listener, or situation makes the subject obvious, it does not need to be said.

Because Japanese often omits the topic or subject when it is already understood.

You could add one if needed:

• 私は商品の魅力を説明した。 = I explained the product’s appeal.
• 彼が商品の魅力を説明した。 = He was the one who explained the product’s appeal.

Without は or が, the sentence is more context-dependent, but completely natural.

It could be either, depending on context.

Japanese nouns usually do not mark singular vs. plural the way English does. So 商品 can mean:

• a product
• products
• the product
• the products

Likewise, 商品の魅力 could mean:

• the appeal of the product
• the appeal of the products
• the products’ attractive points

Context tells you which one is intended.

魅力 means charm, appeal, or attractiveness.

In this sentence, it refers to the points that make the product attractive or appealing. For example:

• good design
• useful features
• convenience
• quality
• price value

So 商品の魅力を説明した sounds like explaining what makes the product appealing, rather than merely listing neutral facts about it.

It is plain style, not polite style.

• 説明した。 = plain past
• 説明しました。 = polite past

So this sentence is natural in:

• written notes
• casual conversation
• narrative writing
• internal reports or captions, depending on tone

If you want to speak politely, you would usually say:

• 商品の魅力を説明しました。

The order here is the most straightforward and natural:

• 商品の魅力を説明した。

Japanese word order is more flexible than English because particles show each word’s role. But the verb normally comes at the end.

So while some parts can move around in longer sentences, this basic pattern is standard:

object + を + verb

And inside the object phrase:

商品 + の + 魅力

Yes. That is a very natural interpretation.

Even though 魅力 literally means appeal or charm, in practical English it often comes out as:

• attractive features
• selling points
• what makes the product appealing

So depending on context, the sentence might sound more natural in English as I explained the product’s selling points.

Yes, absolutely. That is a very useful way to understand it.

You can break the sentence into chunks like this:

• 商品の魅力 = the appeal of the product
• を = object marker
• 説明した = explained

Thinking in chunks helps a lot in Japanese, especially with noun phrases connected by の.