Christian prayers are quite varied. They can be completely spontaneous, or read entirely from a text, like the Anglican Book of Common Prayer. The most common prayer among Christians is the Lord's Prayer, which according to the gospel accounts (e.g. Matthew 6:9–13) is how Jesus taught his disciples to pray. The Lord's prayer is a model for prayers of adoration, confession and petition in Christianity.
Christians generally pray to God or to the Father. Some Christians (e.g., Catholics, Orthodox) will also ask the righteous in heaven and "in Christ," such as Virgin Mary or other saints to intercede by praying on their behalf (intercession of saints). Formulaic closures include "through our Lord Jesus Christ, Your Son, who lives and reigns with You, in the unity of the Holy Spirit, God, through all the ages of ages," and "in the name of the Father, and the Son, and the Holy Spirit."
It is customary among Protestants to end prayers with "In Jesus' name, Amen" or "In the name of Christ, Amen." However, the most commonly used closure in Christianity is simply "Amen" (from a Hebrew adverb used as a statement of affirmation or agreement, usually translated as so be it).
In the Western or Latin Rite of the Roman Catholic Church, probably the most common is the Rosary; In the Eastern Church (the Eastern rites of the Catholic Church and Orthodox Church), the Jesus Prayer. The Jesus Prayer is also often repeated as part of the meditative hesychasm practice in Eastern Christianity.
Roman Catholic tradition includes specific prayers and devotions as acts of reparation which do not involve a petition for a living or deceased beneficiary, but aim to repair the sins of others, e.g. for the repair of the sin of blasphemy performed by others.
Other forms of prayer among Catholics would be meditative prayer, contemplative prayer and infused prayer discussed at length by Catholic Saints St. John of the Cross and St. Theresa of Jesus.