Psalm 42 is a psalm of praise for all that God has done and a prayer for deliverance from the psalmist's enemies. (See: [[rc://en/tw/dict/bible/other/deliverer]])
The psalmist praises God as he remembers what God has done for him in the past, and he puts his trust in him. He needs rescuing from his enemies. Scholars believe that this psalm is about a man in exile longing for Jerusalem.
This psalm is called "a Maschil of the sons of Korah." The word "Maschil" in the original language has caused scholars to have various opinions about its meaning. Some say it means to instruct, while others say that the word is referring to the skill used in creating the psalm. Still others think it means that meditation should be used in reading this psalm.