Dialects form with isolation (physical, cultural, or political). The dialects of Brazil are different from the dialects of Portugal, but they are still the same language.
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The most commonly spoken dialect of Portuguese in the world is Brazilian Portuguese. It is spoken by the majority of Portuguese speakers, primarily in Brazil but also in other countries with Portuguese-speaking communities.
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The language that Brasilians speak is Portugese.(IM SURE OF IT
:)
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The official language of Portugal is Portuguese, which is spoken
by nearly everyone there. There are some local dialects (variations
of the language) used in the Azore Islands or in parts of Portugal
near the border with Spain, especially in the northern parts, but
even people who speak these dialects use Portuguese to
outsiders.