The Psalms are divided into five sections:
|Book I||Psalms 1-41|
|Book II||Psalms 42-72|
|Book III||Psalms 73-89|
|Book IV||Psalms 90-106|
|Book V||Psalms 107-150|
The Psalms appear to have been organized in this way when they were compiled into their final form, probably after the exile.
Each pair of books is separated by a doxology — a short prayer of praise. See Psalm 41:13; 72:18-19; 89:52; 106:48.
The five divisions do not have specific names, but are often thought to be intended to mirror the five books of the Torah (Genesis-Deuteronomy).