Urdu is very similar to Hindi, the most important difference between them being that the former is written in the
Perso-Arabic script, while the latter is written in the Sanskrit characters. Urdu also contains many words from Arabic and Persian, while Hindi makes a conscious effort to preserve the older Indian words.
After the partition of India in 1947, Hindi became the principal language of India, and Urdu of West Pakistan. The older term Hindustani, embracing both languages, has fallen into general disuse since partition.