Visa Stamping is a process in which visa is endorsed in the passport.
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. Some countries do not require a visa in some situations. The country issuing the visa typically attaches various conditions of stay, such as the territory covered by the visa, validity dates and period of stay.