Linked from
The 9 pages that link to Dua, each with the reason it gives.
TawhidRelated: Supplication to God alone gives Tawhid a direct devotional expression.
DhikrRelated: Supplication can accompany remembrance but is distinct from repeated invocation.
ZiyaratRelated: Visitors often make supplications at shrines for themselves and others.
Shrine of Imam RezaRelated: Visitors make supplications at the shrine as part of personal devotion.
Names of God in IslamRelated: The Qur'an encourages calling upon God by the Beautiful Names.
IbadahRelated: Supplication is a devotional act distinct from prescribed ritual prayer.