Prayer is a two-way conversation with the creator of the universe. It can be silent or out loud. We are told to bring our petitions directly to God.
“The effective, fervent prayer of a righteous man avails much. Elijah was a man with a nature like ours, and he prayed earnestly that it would not rain; and it did not rain on the land for three years and six months. And he prayed again, and the heaven gave rain, and the earth produced its fruit.” James 5; 16-18 (NKJV).