1. For the Conductor, a psalm by David.
2. Hear my voice, O God, as I recount [my woes]; preserve my life from the terror of the enemy.
3. Shelter me from the schemes of the wicked, from the conspiracy of evildoers,
4. who have sharpened their tongue like the sword, aimed their arrow-a bitter word-
5. to shoot at the innocent from hidden places; suddenly they shoot at him, they are not afraid.

Tehillim Ohel Yoseph Yitzchok (Kehot Publication Society)

Tehillim is recited by Jewish people collectively and individually, as the desire occurs to offer praise and thanksgiving to G-d; or alternitavely, in times of crisis and need, as a form of supplication, and even as a venue to express regret for sin.

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6. They encourage themselves in an evil thing, they speak of laying traps; they say: "Who will see them?”
7. They sought pretexts; [and when] they completed a diligent search, each man [kept the plot] inside, deep in the heart.
8. But God shot at them; [like] a sudden arrow were their blows.
9. Their own tongues caused them to stumble; all who see them shake their heads [derisively].
10. Then all men feared, and recounted the work of God; they perceived His deed.
11. Let the righteous one rejoice in the Lord and take refuge in Him, and let them take pride-all upright of heart.