Indo-Islamic architecture encompasses a wide range of styles from various backgrounds that helped shape the architecture of the Indian subcontinent from the advent of Islam in the Indian subcontinent around the 7th century. It has left influences on modern Indian, Pakistani and Bangladeshi architecture. Both secular and religious buildings are influenced by Indo-Islamic architecture which exhibit Indian, Islamic, Persian, Central Asian, Arabic and Ottoman Turkish influences, many of which themselves were influenced by Indian architecture through the spread of Indian culture before the advent of Islam.