The term evisa means that the visa is electronic and not a physically printed one on the passport. An eVisa grants the same right to enter territory, as ordinary sticker-visa in the passport. In order to apply for an eVisa, you need to to complete our online application form and pay with your credit/debit card instead of applying through any country's Embassy.
After receiving your eVisa through email, print it out and bring it along when you travel to any country.