Granthi is any person of either gender, who performs the reading of the Guru Granth Sahib

Guru Granth Sahib

Sri Guru Granth Sahib , or Adi Granth, is the religious text of Sikhism. It is the final and eternal guru of the Sikhs. It is a voluminous text of 1430 angs, compiled and composed during the period of Sikh gurus, from 1469 to 1708...

 at congregational occasions, however this task can be performed by any individual who is part of the congregation (Sangat

Sangat

Sangat is a Sikh term with its origin in the Sanskrit word 'sangh', which means company, fellowship and association. In Sikh vocabulary, the word has a special connotation. It stands for the body of men and women who meet religiously, especially in the presence of the Guru Granth Sahib...

). The official Granthi's task is to perform the morning rites (prakash, or opening of the Guru Granth Sahib), reading the paath

Paath

Paath or Path, from the Sanskrit patha which means reading or recitation, is, in the religious context, reading or recitation of the holy texts. In Sikhism, it implies daily repetition of scriptural texts from the Guru Granth Sahib.-Background:...

 and sukhasan (closing the Guru Granth Sahib in the evening). The Granthi is not equivalent to "Priest", as there is no priestly class in Sikhism

Sikhism

Sikhism is a monotheistic religion founded during the 15th century in the Punjab region, by Guru Nanak Dev and continued to progress with ten successive Sikh Gurus . It is the fifth-largest organized religion in the world and one of the fastest-growing...

.