Temporary stay visas allow entry and stay in Portugal for less than a year. Temporary stay visas are valid during the entire stay and allow for multiple entries. Residency visas allow two entries and is valid for a period of 4 months.
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If you are planning to travel to Portugal on a tourist or business trip for a period not to exceed 90 days, you do not need to apply for a visa. You are required to be in possession of a U.S. passport, valid for a minimum of three months beyond the length of your stay.
If you overstay 90 days in the EU, you risk deportation. Countries can legally imprison you, deport you, or give you a limited number of days to leave.