In Jainism, Sammed Shikharji (also known as Sammed Shikhar, or simply Shikharji) is considered the most important and sacred pilgrimage site (tirtha) for both Shwetambar and Digambar Jains. Located on Parasnath Hill in Jharkhand, India, its significance arises from the following:

1. Place of Moksha: According to Jain tradition, twenty out of the twenty-four Tirthankaras (spiritual victors) attained moksha (liberation) here, including Lord Parshvanath, the 23rd Tirthankara.

1. Spiritual Importance: Pilgrimage to Sammed Shikharji is believed to purify one's soul and bring one closer to liberation. Many Jain scriptures and acharyas have praised the spiritual potency of this site.

1. Sacred Geography: The hill is dotted with numerous temples and shrines, each marking the spot where a Tirthankara attained nirvana. The traditional pilgrimage (parikrama) involves a trek of about 27-30 km, visiting all these sacred spots.

1. Cultural Unity: Shikharji is a unifying site for Jains of all sects, who come together here for worship, reflection, and community gatherings.

1. Religious Observances: Many Jains aspire to visit Sammed Shikharji at least once in their lifetime, and it is often the site for vows, austerities, and important religious ceremonies.

In summary, Sammed Shikharji is the holiest Jain pilgrimage site, revered as the place where multiple Tirthankaras achieved liberation, making it central to Jain devotion and practice.