Fasting is abstaining from food and drink. In the Bible, we are given several examples. Jesus and Moses fasted for 40 days and nights. Esther called a fast when her people were in trouble. Anna, a prophetess, served God with fasting and prayer. Daniel in Dan 9:3 “And I set my face unto the Lord God, to seek by prayer and supplications, with fasting, and sackcloth, and ashes.” Fasting allows us to focus on prayer and to seek the Will of God. There is a deep Presence of God that can be entered into when we deny our flesh.
In Matt 17:21 “Howbeit this kind goeth out but by prayer and fasting.” Sometimes it is what is needed to see certain prayers answered.