An e-visa is an electronic visa that is linked to a traveler’s passport. It is an alternative to the traditional paper visa obtained from an embassy or consulate or one issued at a port of entry.
To enter the country you can have e-visa or traditional visa. With an e-visa you will just have to show your passport to the authorities. The system will already have on their records that you have a permit to enter.
Not all countries have e-visa systems in place. Some countries still have the traditional visa. iVisa offers both of them: e-visa and regular visa.