Generally speaking, prayer means addressing or speaking to God in order to give thanks, ask for help, express your feelings etc.
However, there are levels of prayer. These levels of prayer determine the result you get at the end of the day. But it is certain that it is the effectual fervent prayer of the righteous that avails much. Many people fail at the altar of prayer due to ignorance about the mysteries of prayer.
This book will teach you these mysteries and equip you to get to that level, where you prevail always in prayer.