All travelers to Vietnam are required to apply for a visa. This can be done in various ways; by visiting the embassy, by making use of the visa on arrival or by submitting the application entirely online. Applying online is the easiest method and also the method recommended by the embassy for all tourist and business travellers planning to stay in Vietnam for less than 30 days.
Here you can find a step by step explanation on filling in the application form.
In order to be able to use the online application procedure, you must comply with a number of requirements, read them here.
The e-visa is the cheapest and easiest way to get a travel permit; applying can be done online 24/7.