यह आपकी पार्टी का निमंत्रण है।

A word-by-word breakdown is:

• यह = this / it
• आपकी = your (polite/formal), in a form that matches a feminine noun
• पार्टी = party
• का = of, used here as part of a possessive/linking structure
• निमंत्रण = invitation
• है = is

So the literal structure is something like:

This your party of invitation is.

Natural English would be something like This is the invitation to your party or This is your party invitation, depending on context.

This is a very common Hindi pattern.

In Hindi, X का निमंत्रण often means an invitation related to X, not always a strict English-style of relationship.

For example:

• शादी का निमंत्रण = wedding invitation
• पार्टी का निमंत्रण = party invitation

So आपकी पार्टी का निमंत्रण is naturally understood as the invitation for/to your party.

Hindi often uses this X का Y structure where English would use a compound noun or to/for.

Because आपकी is agreeing with पार्टी, and पार्टी is feminine in Hindi.

Hindi possessive forms change to match the gender and number of the noun that follows:

• आपका = your (masculine singular)
• आपकी = your (feminine singular or plural in some contexts)
• आपके = your (masculine plural / masculine singular oblique)

Since पार्टी is feminine, you say आपकी पार्टी.

Because का is agreeing with निमंत्रण, not with पार्टी.

This is one of the trickiest parts for English speakers.

In आपकी पार्टी का निमंत्रण:

• आपकी matches पार्टी because it directly describes पार्टी
• का matches निमंत्रण because it links पार्टी to निमंत्रण

And निमंत्रण is masculine singular, so का is correct.

So the structure is basically:

[आपकी पार्टी] + [का निमंत्रण]
= [your party] + [its invitation / party invitation]

It can function as either, depending on context.

In this sentence, यह most naturally means this:

यह आपकी पार्टी का निमंत्रण है।
= This is the invitation to your party.

But Hindi यह can also be translated as it when English needs that.

A useful rule:

• यह = this / it for something near the speaker or currently being referred to
• वह = that / it for something farther away or previously mentioned

In everyday speech, यह is often pronounced more like ये.

Because Hindi normally places the verb at the end of the sentence.

English usually follows Subject + Verb + Complement:

• This is an invitation

Hindi often follows Subject + Complement + Verb:

• यह ... निमंत्रण है

So this sentence is completely normal Hindi word order.

Also, Hindi uses postpositions rather than prepositions, so words like का come after the noun they relate to.

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

Here it simply means is:

• यह ... है = This is ...

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

In very casual speech, people sometimes drop forms of to be, but for learners, you should keep है here.

Hindi does not have articles like English a, an, and the.

So a Hindi sentence often leaves article meaning to context.

That means निमंत्रण could be understood as:

• an invitation
• the invitation
• sometimes even just invitation

depending on the situation.

That is why the same Hindi sentence can be translated into English in slightly different ways.

Yes, if you want a less formal version.

• आपकी = your (polite/formal)
• तुम्हारी = your (informal/friendly)
• तेरी = your (very informal, sometimes rough or very intimate depending on context)

So you could say:

यह तुम्हारी पार्टी का निमंत्रण है।

That means the same thing, but with a more informal you.

The original sentence sounds polite because of आपकी.

Yes, निमंत्रण is a fairly standard and somewhat formal word for invitation.

In everyday speech, people may also use:

• इनविटेशन = a borrowed English word, very common in casual Hindi
• न्योता = a more traditional, conversational word in many contexts

So:

• यह आपकी पार्टी का निमंत्रण है। sounds correct and somewhat formal
• यह आपकी पार्टी का इनविटेशन है। sounds more casual and modern

A simple pronunciation guide is:

yah aapki party ka nimantran hai

A few notes:

• यह is often pronounced yeh
• आपकी = aap-kee
• पार्टी = paar-tee
• निमंत्रण is roughly ni-man-tran
• है is usually like hai, rhyming roughly with eye, but shorter

A natural slow pronunciation would be:

yeh aap-kee paar-tee ka ni-man-tran hai

Yes, it is grammatical and natural, especially in a polite or slightly formal context.

It sounds like something you might say while handing someone an invitation card or showing it to them.

If you wanted to be even more explicit, you might sometimes hear:

• यह आपकी party का invitation है in mixed casual Hindi-English
• यह आपकी पार्टी का निमंत्रण-पत्र है if you specifically mean invitation card/letter

But the original sentence is perfectly fine as standard Hindi.