To the conductor, for the sons of Korah. This is what the verse (Proverbs 15:24) means: "The path of life is above for the wise." In this psalm, "like a deer that longs for streams of water" - the word "deer" is used instead of "doe," in the masculine form, to indicate remembrance and not female. This deer, when sitting by the water, is distressed and yearns for the Lord, who answers her.
The sons of Korah called out to the Lord in distress, and He answered them. Therefore, it is said, "like a deer that longs." Why "for streams of water"? This deer is a pious animal and, when the animals are thirsty, it longs for the Lord.
This is also mentioned in Psalm 42. Another explanation: Just as the deer yearns for the Lord, so does Esther say (Psalm 22:20), "My strength, come quickly to help me." My soul is thirsty. And what is my soul thirsty for?
She said to him, "I am not thirsty for food or drink, but my soul is thirsty for you. To see your face, I say to my heart, 'Seek His face.'" Therefore, it is said, "My soul thirsts for you."...