A practice in many Zen monasteries and centers is a daily liturgy service. Practitioners chant major sutras such as the Heart Sutra, chapter 25 of the Lotus Sutra (often called the "Avalokiteśvara Sutra"), Song of the Precious Mirror Samadhi, the Nīlakaṇṭha Dhāraṇī, and other minor mantras.
The butsudan is the altar in a monastery where offerings are made to the images of the Buddha or bodhisattvas. The same term is also used in Japanese homes for the altar where one prays to and communicates with deceased family members. As such, reciting liturgy in Zen can be seen as a means to connect with the Bodhisattvas of the past. Liturgy is often used during funerals, memorials, and other special events as means to invoke the aid of supernatural powers.
Chanting usually centers on major bodhisattvas like Avalokiteśvara (see Guanyin) and Manjushri. According to Mahayana Buddhism, bodhisattvas are beings who have taken vows to remain in saṃsāra to help all beings achieve liberation from it. Since the Zen practitioner's aim is to walk the bodhisattva path, chanting can be used as a means to connect with these beings and realize this ideal within oneself.