Green cards are of two types: unconditional, i.e. permanent and conditional, i.e., temporary. Conditional green cards are issued to the marriage with a citizen of the United States. They are valid for 2 years. If after this period, the marriage continues then the green card becomes unconditional.
Obtaining a green card - it is always quite lengthy procedure. You must complete the application to receive the status of permanent resident, get an immigrant visa. Within 6 months of receipt of the immigrant visa must arrive in the US and file a petition to receive a green card. If you do not come to US on time, right to petition will not be. Depending on what basis you can get a greencard, the process is complemented by the other phases, the applicant is required to provide certain documents. For example, if you work in the U.S., the employer must collect certain documents for you and attach it to the petition.
A green card gives the holder the right to live and work in the USA, get an education, to enjoy the social privileges of the Americans. In addition, after 5 years the owner of a green card may file the petition for us citizenship. However, it should be remembered that the owner of a green card is also required to pay taxes and not break the law, otherwise it can be taken away. In addition, he has no right to leave the US for more than 6 months.
Each year the State Department of the United States holds a lottery of 50,000 immigrant visas which give their owners the right to get a greencard. For this you need to fill out a form on the website www.dvlottery.state.gov. It should be noted that the right to thus obtain a greencard is not at all: participant must have a high school education or two years of experience, to be mentally healthy and not judged.