Bhojpuri has historically been written in the Kaithi script, a cursive script once widely used across Bihar for administrative and everyday writing, though Bhojpuri today is predominantly written in Devanagari.

Bhojpuri belongs to the Eastern Indo-Aryan language group, closely related to Maithili and Magahi — these three are sometimes collectively referred to as the 'Bihari languages', sharing a common historical descent from Magadhi Apabhramsha/Prakrit.

• ›Kaithi script's decline parallels Tirhuta's decline in Maithili — a broader pattern across Bihar's languages shifting toward Devanagari
• ›Recognizing this shared Eastern Indo-Aryan/Bihari grouping helps contextualize Bhojpuri's grammatical similarities to Maithili and Magahi