A visa is a document showing that a person is authorized to enter the territory for which it was issued, subject to permission of an immigration official at the time of actual entry. The authorization may be a document, but more commonly it is a stamp endorsed in the applicant's passport.
An Entry visa is granted to the following types of applicants.
A person of Indian Origin, defined as a person who has held Indian nationality or is a child or grandchild of a person who has held Indian nationality.
In fact, persons of Indian Origin must apply for an Entry Visa instead of a Tourist Visa.