Prayer means talking to and hearing from, or interaction with God. It includes worship, praises and thanksgiving, which can be expressed in songs and in plain speech (cons. Ex. 15:11; 1Chr. 16:23-36; Ps. 93:1-4; 100:1-5; Rev. 4:8-11). It also includes petition and supplication (Ps. 18:3-6; 34:6; 40:1,2).
There is the prayer of intercession which is a high form of prayer (Ex. 17:10-13; Ezk. 22:30,31). Besides, binding devils and loosing our blessings and possessions which they stole or tied away, as well as those of others, is also a form of prayer (Matt. 18:18).