A visa is a permit, issued by a federal authority, allowing a foreign national to enter another country. Most of the time, visas can only be issued abroad. Travellers are advised to check the necessary requirements to obtain a visa in advance, as the entire process may take several weeks.
To find out if you need a visa to enter Brazil, please check Entrance visas for Brazil or the nearest Brazilian Consulate.
When the need for a visa is waived, as a result of diplomatic agreements signed between Brazil and certain countries, a permit may be issued upon arrival for foreign nationals to enter and remain in the country during a fixed period of time. In this case, a visa application is not needed - so long as the visitor's passport is valid upon arrival to Brazil. Notice that each permit request will be assessed upon arrival and considering the purpose of the trip. Therefore please make sure to bring any relevant support documentation with you when travelling to Brazil to attend ISI2015.
If you need a tourist visa, fill out the Visa Application Form - available in Portuguese, Spanish, French and English - and go to the Brazilian Consulate nearest you (Brazilian Consulates abroad).