DHL Express is a division of the German logistics company Deutsche Post providing international express mail services.  DHL is a world market leader in sea and air mail. 
Originally founded in 1969 to deliver documents between San Francisco and Honolulu, the company expanded its service throughout the world by the late 1970s. The company was primarily interested in offshore and inter-continental deliveries, but the success of FedEx prompted their own intra-US expansion starting in 1983. DHL aggressively expanded to countries that could not be served by any other delivery service, including the Soviet Union, Eastern Bloc, Iraq, Iran, China, Vietnam and North Korea.
In 1998, Deutsche Post began to acquire shares in DHL. It finally reached majority ownership in 2001, and completed the purchase in 2002. Deutsche Post then effectively absorbed DHL into its Express division, while expanding the use of the DHL brand to other Deutsche Post divisions, business units and subsidiaries. Today, DHL Express shares its well-known DHL brand with other Deutsche Post business units, such as DHL Global Forwarding and DHL Supply Chain.
DHL Express's global headquarters are part of the Deutsche Post headquarters in Bonn.
Headquarters for the Americas are located in Plantation, Florida, USA, while its Asia-Pacific and Emerging Markets headquarters are located in Singapore, Malaysia and Hong Kong. The European hub is in Leipzig.
Most of DHL Express' business is incorporated as DHL International GmbH.
Major competitors include FedEx, UPS, TOLL, TNT and national post carriers such as United States Postal Service and Royal Mail. However, DHL has a minor partnership with the USPS, which allows DHL to deliver small packages to the recipient through the USPS network. It is also the sole provider for transferring USPS mail in and out of Iraq and Afghanistan.
DHL offers worldwide services, including deliveries to countries such as Iraq, Afghanistan and Burma. As it is German-owned, DHL is not affected by U. S. Embargoes or sanctions and will ship to Cuba,  Iran and North Korea.  However there are strict codes for delivering to North Korea, as the country has shaky relations with the West. 
As DHL is not a US company, it is not allowed to make domestic flights between U. S. Airports. DHL contracts these services to other providers.