A 30 Days Visa Single Entry is a type of travel visa that allows an individual to enter a foreign country for a designated period of 30 consecutive days for a single visit. It means that once you enter the country, you can stay for up to 30 days, after which you must exit the country. It's important to note that this type of visa usually does not permit multiple entries. If you leave the country during the 30-day period, you may not be allowed to re-enter on the same visa.