Learn Farsi: آیا این فیلم جالب است یا نه؟

In Farsi, the phrase for 'or not' at the end of a question is literally 'or no', which is yâ na. You don't need a special word for 'not' here; you just use the standard word for 'no'.

Does the conjunction یا (yâ) always mean 'or'?

Yes, yâ is the standard word for 'or' when offering a choice between two things, just like in English. Here it links the main question to the alternative negative choice (na).

Is the word آیا (âyâ) required to make this a question?

Not in everyday spoken Farsi. âyâ is a formal question word used at the beginning of yes/no questions. In casual conversation, Iranians usually drop it and just say in film jâleb ast yâ na?, raising their voice at the end to show it is a question.

Farsi verbs usually go at the very end. Why is است (ast) placed before یا نه (yâ na)?

You are right that the main verb (ast) goes at the end of its clause. The core sentence is âyâ in film jâleb ast (Is this movie interesting?). The yâ na (or not) is an alternative choice added afterwards, so the phrasing perfectly mimics the English word order: [Main question] + or + [no].