Greifswald is a very old town and gained city rights as early as 1240. In 1278, Greifswald became a part of the Hanseatic League and in 1456, the university was founded. From 1648 to 1815, Greifswald was a part of Sweden‘s northern German territories. Following the Second World War, the town became a part of the Soviet occupation zone. The town fared rather well during and after the war, but during the Soviet and East German reign, the economy and infrastructure declined. Following reunification, huge sums of money have been pumped into the area to help improve the situation and lower the unemployment rates.
The easiest way to get to Greifswald is probably by car, but there are other options. Going by air is restricted to season.
The airport is not connected directly to the railway network, but you can take a bus or cab to the next train station and take the train from there.
Somewhat further away is Rostock-Laage (RLG IATA) airport which mostly serves cruise passengers leaving or arriving at Rostock-Warnemünde. That airport is likewise not connected directly to the railway network, bu it sees som service through Intercity buses.
The Berlin airports Tegel (TXL IATA) and Schönefeld (SXF IATA) see much more service but are some three hours away by train Tegel is not connected to either the Berlin U-Bahn or the S-Bahn so you’ll have to take a bus to the next station.