If you're intending to travel to the US, either as a tourist, or on business, the first thing you should consider is your Electronic System for Travel Authorisation (ESTA) application. All citizens of countries listed in the US Visa Waiver Program need an Electronic System for Travel Authorisation in order to travel to, or even through, the US
Citizens of countries within the VWP (Visa Waiver Program) are required to obtain an Electronic System for Travel Authorisation in order to travel to or through the US. The ESTA visa system is operated by the US Government Department for Homeland Security, and Electronic System for Travel Authorisation applications may only be made electronically online.
An ESTA approval number gives the applicant approval to travel to the US, however, it does not give the applicant the right to enter the US - this is down to the US border control authorities. Of course, it is rare for a traveller to be stopped at the border, but it can happen. An ESTA does NOT give the applicant the right to reside or work in the US, and it is only valid for a maximum of 2 years from date of issue (or until expiry date of passport, whichever is sooner).
Citizens of the following countries only are eligle to apply for ESTA under the Visa Waiver Program:
Republic of Malta