Hallel (pesukei dezimra)
Hallel of pesukei dezimra a selection of six psalms recited as part of pesukei dezimra ('verses of praise') – the introduction the daily morning service. This "Hallel" consists of Ashrei (most of which is Psalm 145) followed by Psalms 146–150. The term Hallel, without a qualifier, generally refers to Psalms 113-118, which are recited only on festivals; for this reason the Hallel of pesukei dezimra is also known as the daily Hallel.
These psalms are recited because they are devoted entirely to the praise of God.
Originally, this was the only part of pesukei dezimra. Its recitation was considered voluntary for a long time.