Citizens of Bahrain, Kuwait, Qatar, Oman and Saudi Arabia do not need a visa to enter UAE. You simply need to produce your GCC country passport or ID Card upon arrival in the UAE.
Citizens of 45 other countries (including the US, UK, Singapore, Malaysia, Australia and many EU countries) are granted a free tourist visa upon arrival in the UAE, which is valid for 30 days. To see if your country is on the list, check with your local consular office or visit the Ministry of Foreign Affairs website.
If you do not fall into one of the above categories, you will need to arrange a visa and a sponsor before you travel. The sponsor normally applies for the visa on your behalf. Hotels and tour companies can apply for a Tourist Visa for you, which is valid for 30 days, or a Visit Visa, which is valid for 30 days and can be extended for other 30 days.
UAE residents may, subject to guidelines, also apply on your behalf for a Visit Visa.
For more information, contact your local consular office or visit the Ministry of Foreign Affairs website.