Kavach

Kavachas are not just for protection. Many sources recommend doing sadhana of the kavach of your ishtha as a very important step for a beginner, since it not just gives protection, but also accelerates paap-naash. Kavachas typically include lots of names of the deity, requesting them to protect corresponding parts of the body. For Sadhana, Kavachas should be chanted loudly.
Concept
Kavaca

A protective text or armor recited for a deity's shielding power — such as the Durga Kavach or Hanuman Kavach.