پس‌زمینه توسط تیم دسته‌بندی می‌شود.

From Lesson 420:Object topicalization·Farsi

Questions & Answers about پس‌زمینه توسط تیم دسته‌بندی می‌شود.

Since the object ("background") is at the beginning of the sentence, why doesn't it have را (râ) like in our other OSV fronting examples?
Because this sentence is actually in the passive voice, not an active OSV sentence! In OSV fronting, the verb remains active, and the fronted object needs را to show it's still the object (e.g., پس‌زمینه را تیم دسته‌بندی می‌کند - "The team sorts the background"). Here, the verb می‌شود makes the sentence passive, so پس‌زمینه is technically the grammatical subject and does not take را.
What is the function of توسط (tavasot-e) here?
توسط means "by" or "through the means of." In Farsi, passive sentences usually omit the "doer" of the action completely. However, when you absolutely need to include who performed the action (the agent) in a passive sentence, you introduce them with توسط.
How is the passive voice formed for this compound verb?
The active infinitive is دسته‌بندی کردن (to sort / to categorize). To make a compound verb ending in کردن (to do) passive, you simply replace it with the conjugated form of شدن (to become). Thus, دسته‌بندی می‌کند (it sorts) becomes دسته‌بندی می‌شود (it is sorted).
Is پس‌زمینه used for a physical background or an abstract one?
It is used for both! پس‌زمینه literally translates to "behind-ground" and works perfectly for the background of an image, a computer wallpaper, or the contextual background of a story or situation.

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