Jehovah's Witnesses's practices are based on the biblical interpretations of Charles Taze Russell (1852–1916), founder of the Bible Student movement, and of successive presidents of the Watch Tower Society, Joseph Franklin Rutherford and Nathan Homer Knorr. Since 1976, practices have also been based on decisions made at closed meetings of the group's Governing Body. The group disseminates instructions regarding activities and acceptable behavior through The Watchtower magazine and through other official publications, and at conventions and congregation meetings.

Jehovah's Witnesses is a nontrinitarian, millenarian, restorationist Christian denomination. As of 2023, the group reported approximately 8.6 million members involved in evangelism, with around 20.5 million attending the annual Memorial of Christ's death. Jehovah's Witnesses believe that the destruction of the present world system at Armageddon is imminent, and the establishment of God's kingdom over earth is the only solution to all of humanity's problems.