Katha is the verbal explanation/discourse of Gurbani (the utterings of the Guru’s) and our great history. Katha has been an integral part of Sikh practice since the revealed inception of Sikhism by Sri Guru Nanak Dev Jee.
Sri Guru Nanak Dev Jee and great Sikhs of his era performed Katha and it was and is still through Katha that many people gain knowledge about Sikhism and become enlightened. Katha is both a spiritual and historical discourse, it endows the listener with spiritual and worldly knowledge, and helps Sikhs along the path of Sikhi.
Gurbani Katha is also a form of Amrit, as the teachings verbally expressed in Katha make us reach this sublime stage of immortality. Katha is not just expressed on a stage in a Gurdwara, it can exist in conversation and discussion as well, so all the above quotations are relevant if we are promoting the idealogy of Gurbani when we are discussing things. This Katha is described as the most supreme discourse to enter.