A single entry visa allows you to enter Sweden only once during its validity period. After you enter and leave the Schengen Area, the visa cannot be used again, even if you still have days left. This type of visa is suitable for people who are planning a one-time visit for tourism, family visit, or a short business trip. If your travel plan includes only one visit, this visa is enough. If you plan to travel multiple times, you should consider a multiple entry visa.