In order to travel to Cambodia, people of almost all nationalities, excluding Cambodia, are required to obtain a visa.
There are several types of visa. Among them, electronic visas that can be applied for over the internet are referred to as e-Visas.
Since e-Visas are applied for over the internet, they cannot immediately be issued on a passport when the application passes inspection. For that reason, they are issued by stamping the passport at an immigration inspection location of Cambodia.
In addition, in order to undergo the immigration inspection, the separate e-Visa Certificate*1 must be presented.
*1: Because the e-Visa is issued at the time of the immigration inspection, if you are denied entry to the country as a result of the immigration inspection, issuance of your e-Visa may also be denied.