It's not perfectly clear what you mean by a black document in terms of your visit to Spain, it could be that you are referring to a passport, which of course is a must for any foreign trip or vacation abroad. Anyone from outside of Spain will need a passport in their possession if they are planning on visiting the country.
The rules on visas for visiting countries is a complicated issue and it is always worth checking before making travel arrangements as rules vary from country to country. If you are traveling to Spain from another European nation you will not require any kind of visa, as long as you have a valid passport you are legally allowed to visit Spain for as long as you like, as many times as you like. If you are planning on staying indefinitely though, it is worth notifying the authorities in Spain of your whereabouts and if you are planning on working you will need to register for a social security number to make sure you are paying taxes and health care contributions.
If you are visiting Spain from The USA you will also require a valid passport but if you are only planning a short vacation you will not require a visa. Europe and The USA have in operation what is known as a Visa Waiver program, which basically allows citizens to visit Europe or America for recreational purposes for up to 90 days.
So a five day vacation would not require a visa, but if you are planning on working in Spain or staying for a long period of time you would need to apply for a visa at the relevant embassy.
The rules on visas for visiting countries is a complicated issue and it is always worth checking before making travel arrangements as rules vary from country to country. If you are traveling to Spain from another European nation you will not require any kind of visa, as long as you have a valid passport you are legally allowed to visit Spain for as long as you like, as many times as you like. If you are planning on staying indefinitely though, it is worth notifying the authorities in Spain of your whereabouts and if you are planning on working you will need to register for a social security number to make sure you are paying taxes and health care contributions.
If you are visiting Spain from The USA you will also require a valid passport but if you are only planning a short vacation you will not require a visa. Europe and The USA have in operation what is known as a Visa Waiver program, which basically allows citizens to visit Europe or America for recreational purposes for up to 90 days.
So a five day vacation would not require a visa, but if you are planning on working in Spain or staying for a long period of time you would need to apply for a visa at the relevant embassy.
