The UAE has been promoting tourism for decades and visa reforms were one of the key factors through which the administration was trying to achieve this objective.

Visit Visa
Single Entry Visa: Allows you to enter once for a period of 30/60 days within its validity period.
30 days | 60 days
Multiple Entry Visa:Allows you to enter multiple times within its validity period.
30 days | 60 days

Transit Visa
48 hours transit visa: which allows the traveler to transit for two days
96 hours transit visa: which allows the traveler to transit for four days

Medical Visa
You can use this visa to undergo medical treatment in the UAE for a period of 60 to 90 days,provided your main purpose of visit is for medical treatment in any of the UAE hospitals.
5-Year Multiple Entry Visa
This visa will be helpful for business men who travel frequently to UAE. This allows you to stay in the UAE for 90 days during each visit and can be extended for another 90 days.

Dubai Visa On Arrival (AED: 120/-)
To avail this visa the traveler has to comply with the following requirements and can stay in the UAE for 14 days and also can extend it to another 14 days:
Have a valid passport with six months validity.
Should possess either a permanent resident visa in U.K (or)
Green card or valid visit visa from US.(or)
a residence visa issued by the European Union.
They should have return or onward confirmed flight ticket,