Jy is welkom.

• jy = you
• is = are / is
• welkom = welcome

So the sentence is literally You are welcome.

Afrikaans, like English, normally needs a form of to be in this kind of sentence.

So:

• Jy welkom would sound incomplete
• Jy is welkom is the normal full sentence

It works just like English You are welcome.

A rough English-friendly guide is:

• Jy ≈ yay with a slightly different vowel
• is ≈ iss
• welkom ≈ VEL-kom or VEL-kum

So the whole sentence is roughly:

yay iss VEL-kom

That is only an approximation, but it is close enough for a beginner.

Yes. jy is the normal informal singular you.

If you want to be more polite or formal, Afrikaans often uses u:

• U is welkom = You are welcome (formal)

If you are speaking to more than one person informally, you can use:

• Julle is welkom = You are welcome (plural)

Yes, it is a normal and natural response.

For example:

• Dankie. = Thank you.
• Jy is welkom. = You’re welcome.

In everyday speech, Afrikaans speakers may also use other polite replies, but Jy is welkom is completely correct and easy for learners to use.

Yes. Like English, it can work in more than one situation.

It can mean:

• a reply to thanks: You’re welcome
• an invitation or reassurance: You are welcome

For example:

• Jy is welkom om te kom. = You are welcome to come.

So context tells you which sense is intended.

Yes. They are clearly related words.

That makes welkom easy for English speakers to remember. The spelling is slightly different, but the meaning is very close.

No. You only capitalize Jy when it starts a sentence.

So:

• Jy is welkom.
• Ek dink jy is welkom.

The second one has lowercase jy because it is in the middle of the sentence.

In careful standard writing, it is safest to use the full form:

• Jy is welkom.

In casual speech or very informal writing, you may sometimes come across contractions, but as a learner, the full form is the best choice.

Often, yes. But in real conversation, people may also use other short polite replies depending on region, tone, and situation.

Still, Jy is welkom is:

• clear
• polite
• standard
• easy to understand

So it is an excellent phrase to learn and use.

Use julle for informal plural:

• Julle is welkom. = You are welcome. / You all are welcome.

If you want to be formal, u can also be used depending on the situation:

• U is welkom.

So the version changes mainly according to who you are addressing.

In a normal statement, yes:

• Jy is welkom.

If you turn it into a question, the word order changes:

• Is jy welkom? = Are you welcome?

That is standard Afrikaans word order: the verb usually comes first in yes/no questions.