The word dua itself means “to call out to God.” Supplications and prayers (dua) focus on the idea that human beings are in constant need of God. Even those who reach the peak of wealth, knowledge, strength, and dignity still are in need of God.
Dua is of equal importance to people inflicted by calamities and hardships, as well as to those living in comfort and abundance.
Speaking with God through dua defends oneself against adversity and tribulation, and leads one to salvation and relief. Islam encourages its followers to offer dua constantly, either using their personal words – directly from the heart, or repeating some of the inspirational words of the Prophet and his successors [imams] that have been handed down to us.
God has given a guarantee in the Quran to His servants that He will answer their prayers,
“And your Lord says, “Call upon me, I will answer your prayer.” (40:60)
Elsewhere in the Quran, He says,
“When My servants ask you concerning Me, I am indeed close to them. I listen to the prayer of every suppliant when he calls upon Me. Let them also with a will listen to My call and believe in Me, that they walk in the right way.” (2:186)