A hymn is a type of song, and partially synonymous with devotional song, specifically written for the purpose of adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification. The word hymn derives from Greek ὕμνος (hymnos), which means "a song of praise". A writer of hymns is known as a hymnist. The singing or composition of hymns is called hymnody. Collections of hymns are known as hymnals or hymn books. Hymns may or may not include instrumental accompaniment. Polyhymnia is the Greco/Roman goddess of hymns.
Arvid Liljelund [de; fi; sv]'s Man Singing Hymn (1884)
In Christianity, church congregations often sing hymns together as part of their worship (Pictured: worshippers at Uffington Parish Church in England, 1944)
Hymns are often accompanied by organ music
Sanskrit manuscript page from the "Vivaha sukta" Rigveda, dated 1500–1200 BCE
Prayer is an invocation or act that seeks to activate a rapport with an object of worship through deliberate communication. In the narrow sense, the term refers to an act of supplication or intercession directed towards a deity or a deified ancestor. More generally, prayer can also have the purpose of thanksgiving or praise, and in comparative religion is closely associated with more abstract forms of meditation and with charms or spells.
A kneeling position with raised hands expressed "supplication" in classical antiquity. The word for "prayer" and for "supplication" is identical in ancient languages (oratio, προσευχή, תְּפִלָּה etc.), with no terminological distinction between supplications addressed to human as opposed to divine powers. Statuette known as "Praying German" or "supplicating barbarian". It is not known if this figure was originally set in a context of religious prayer or of military surrender.
The valkyrie Sigrdrífa says a pagan Norse prayer in Sigrdrífumál; illustration by Arthur Rackham
Old woman praying by Théophile Lybaert
Captain Samuel Cass, a rabbi, conducting the first prayer service celebrated on German territory by Jewish personnel of the First Canadian Army near Cleve, Germany, 18 March 1945