If you are a citizen in a country outside the EU and want to visit Sweden for a maximum of 90 days, you may need to apply for a visa. A visa is only valid for your stay in the Schengen countries for up to 90 days during a period of 180 days.
If you are a citizen of a country outside the EU and you want to visit Sweden (and the other Schengen countries), you may need to apply for a visa. A visa is a permit to enter a country and stay there up to 90 days.
A visitor's visa is valid for a maximum of 90 days. If you have already stayed in a Schengen country for 90 days during the last 180-day period, you cannot extend your visa. Instead you can apply for a visitor's residence permit