बर्फ ठंडी है।

Because बर्फ is treated as a feminine noun in Hindi, and adjectives like ठंडा / ठंडी / ठंडे change to match the gender and number of the noun.

• masculine singular: ठंडा
• feminine singular: ठंडी
• masculine plural: ठंडे
• feminine plural: usually ठंडी with many adjectives of this type in direct usage

So:

• पानी ठंडा है। = The water is cold.
• बर्फ ठंडी है। = The ice/snow is cold.

है means is.

So the sentence structure is:

• बर्फ = ice / snow
• ठंडी = cold
• है = is

Together: बर्फ ठंडी है। = The ice is cold. / Snow is cold.

In simple present-tense descriptions, Hindi often uses this pattern:

noun + adjective + है

Hindi commonly puts the subject first, then the description, and the verb है at the end.

So:

• बर्फ = subject
• ठंडी = description
• है = is

This is very normal Hindi word order:

• आसमान नीला है। = The sky is blue.
• चाय गरम है। = The tea is hot.
• बर्फ ठंडी है। = The ice is cold.

English uses subject + is + adjective, but Hindi usually uses subject + adjective + is.

It can mean both, depending on context.

• In everyday speech, बर्फ often means ice
• It can also mean snow

So बर्फ ठंडी है। could be understood as:

• Ice is cold
• Snow is cold

Usually the situation makes the meaning clear.

A simple learner-friendly pronunciation is:

barf thandee hai

A little more detail:

• बर्फ ≈ barf
• ठंडी ≈ thun-dee or than-dee
  The ठ is a retroflex t sound, not exactly like English t
• है ≈ hai, sounding a bit like heh or hai depending on accent and speaking style

If you are a beginner, barf thandee hai is a good practical approximation.

Here, ठंडी is an adjective, meaning cold.

It is describing बर्फ.

So this is a simple descriptive sentence:

• बर्फ = noun
• ठंडी = adjective
• है = verb (is)

Be careful not to confuse this with ठंड, which is a noun meaning coldness or cold weather.

For example:

• ठंड है। = It is cold.
• बर्फ ठंडी है। = The ice is cold.

In full standard Hindi, you normally keep है:

बर्फ ठंडी है।

In casual speech, people sometimes drop it if the meaning is obvious:

बर्फ ठंडी।

But this sounds incomplete in careful standard Hindi. For learners, it is best to use है.

Hindi does not usually use articles like a, an, and the the way English does.

So बर्फ ठंडी है। can mean:

• Ice is cold
• The ice is cold
• sometimes even Snow is cold

The exact English translation depends on context.

This is very common in Hindi. You often do not need a separate word for the.

Yes, it can.

If you were talking about plural feminine things, the verb would usually become हैं instead of है.

For example:

• singular: बर्फ ठंडी है।
• plural feminine: चीज़ें ठंडी हैं। = The things are cold.

With adjectives like ठंडा, the form also changes depending on gender and sometimes number:

• ठंडा = masculine singular
• ठंडी = feminine singular
• ठंडे = masculine plural / some other grammatical contexts

So agreement is an important part of Hindi grammar.

Yes, but it means something slightly different.

• बर्फ ठंडी है। = The ice is cold. / Ice is cold.
• बर्फ ठंडी होती है। = Ice is cold / Ice tends to be cold / Ice is generally cold.

The version with होती है often sounds more like a general truth or habitual fact.
The version with just है is the simplest direct description.

For a beginner, बर्फ ठंडी है is the most straightforward form to learn first.