I want to know the answer to the following question:
What conquered large areas of northern India?
All the background I'm provided with is that "It is surmised that the language of Urdu (literally meaning "horde" or "camp" in various Turkic dialects) was born during the Delhi Sultanate period as a result of the intermingling of the local speakers of Sanskritic Prakrits with immigrants speaking Persian, Turkic, and Arabic under the Muslim rulers.". Is that enough to answer the question?
Answer: no