Travellers who wish to visit Qatar must have the correct documentation before arriving in the country. Having all the proper paperwork will save you problems or even a denied entry. Border control will check that you have a valid passport and additional documents according to your purpose of travel and nationality.
If you are a citizen of an eligible country and are travelling to Qatar for tourism purposes, then you must process your electronic visa before your trip. This e-Visa can be used over a period of one month and for a stay of up to 30 days from the date of arrival.