Official Language for Communication Between One State and Another or Between a State and the Union
The language for the time being authorised for use in the Union for official purposes shall be the official language for communication between one State and another State and between a State and the Union: Provided that if two or more States agree that the Hindi language should be the official language for communication between such States, that language may be used for such communication.
What this Article actually means
How it shows up in everyday life
This is why official correspondence between, say, the central government and a state (or between two different states) generally happens in Hindi or English, even if those states' own internal official languages are different regional languages.
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Quick answers about Article 346
Can two southern states with different official languages agree to communicate in a regional language instead?
The text above reproduces Article 346 of the Constitution of India as amended to date, for general educational reference. It is public-domain legislative text, but we recommend cross-checking the authoritative version at legislative.gov.in or india.gov.in before relying on it for a legal matter. The explanation, examples and FAQs are general information, not legal advice — consult a qualified advocate for guidance on your specific situation.