The Khordeh Avesta, the Little Avesta, is not an independent composition but a compilation, drawn from across the wider Avesta, of the prayers and short texts a lay Zoroastrian is expected to know and use in daily devotional life. Where the Yasna, Visperad and Vendidad belong to priestly ceremony, the Khordeh Avesta exists for people without priestly training: it gathers material for the five daily prayer periods, the gahs, along with niyayeshes addressed to the sun, the moon, water and fire, and other short devotional texts drawn from the Yashts and elsewhere.
Because it is an anthology rather than a single authored work, the Khordeh Avesta has no fixed content across every community that uses one. Editions vary somewhat in what they include, reflecting differences between Zoroastrian communities in Iran and the Parsi communities of South Asia, and modern printed editions typically add transliteration and translation so that prayers composed in a language most users no longer speak remain usable in daily life.
Parsi editions produced in India have historically differed somewhat from those used by Zoroastrian communities remaining in Iran, reflecting centuries of separate transmission after many Zoroastrians left Iran for South Asia following the Arab conquest, though the core daily prayers remain shared across both traditions.