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. During that time, the holder of a residency visa is required to request a residency permit with the Immigration and Border Services (SEF).
A Schengen Visa is an authorization issued by one of the Member-States for the purpose of airport transit, transit or an intended short stay in a territory of one or more Member-States, allowing its holder to present him/herself at the external frontier, but does not automatically guarantee his/her respective entrance, which will be decided by the border authorities upon arrival.
The Schengen visa is a short stay visa for a maximum period of ninety (90) days during any hundred and eighty (180) days period, and can be granted for tourism, family visit, business, seasonal work, transit, among others.