बटन काला है।

• बटन = button
• काला = black
• है = is

So the structure is literally button black is.

Hindi usually follows Subject + Complement + Verb word order.

So:

• बटन = subject
• काला = description
• है = verb

That is why है comes at the end.

Hindi does not normally use articles like English a/an/the.

So बटन can mean:

• a button
• the button

The exact meaning depends on context.

बटन is a borrowed word from English button, written in Devanagari script.

This is very common in Hindi. Many everyday words are borrowed and adapted to Hindi pronunciation and spelling.

The adjective काला changes form to match the noun in gender and number.

Here, बटन is treated as masculine singular, so the adjective is काला.

Compare:

• काला = masculine singular
• काली = feminine singular
• काले = masculine plural

So बटन काला है is correct for the button is black.

In Hindi, every noun has grammatical gender, even borrowed words.

बटन is generally used as a masculine noun. Because of that, adjectives and sometimes other words agree with it.

There is not always a simple rule you can guess from English, so learners often need to learn the gender of nouns along with the noun itself.

है is the present-tense form of the verb to be for he/she/it/this/that and singular nouns in sentences like this.

So in बटन काला है:

• है = is

Without है, the sentence would sound incomplete in standard Hindi conversation.

A simple pronunciation guide is:

ba-tan kaa-laa hai

A bit more closely:

• बटन ≈ but-un / bəʈən
• काला ≈ kaa-laa
• है ≈ hai (like heh or hai, depending on accent)

The ट sound in बटन is a retroflex t, made with the tongue curled slightly back.

Here काला is an adjective meaning black. It behaves like a normal Hindi adjective and agrees with the noun.

So it can be used in many sentences:

• कुत्ता काला है। = The dog is black.
• किताब काली है। = The book is black.

Yes. That means This button is black.

• बटन काला है। = The/A button is black.
• यह बटन काला है। = This button is black.
• वह बटन काला है। = That button is black.

Adding यह or वह makes the reference clearer.

You would say:

बटन काले हैं।

Changes:

• काला → काले because the noun is now masculine plural
• है → हैं because the subject is plural

So:

• बटन kाला है। = The button is black.
• बटन काले हैं। = The buttons are black.

In normal, complete spoken and written Hindi, you usually keep है.

So the standard sentence is:

• बटन काला है।

You might see the verb omitted in:

• labels
• notes
• very informal contexts
• poetry
• headlines

But as a learner, it is best to include है.

Yes, it is grammatically correct and natural.

Because बटन is a common borrowed noun and काला है is a normal adjective + copula pattern, the sentence sounds perfectly fine in everyday Hindi.