From WikiHow:

“Panorama stitching is a way to emulate having a much wider field of view than your lens and camera would provide by themselves. Hugin is an open-source panorama stitching program, built around Panorama Tools. While it may not be as easy to use as some alternatives, the basics of using it to create panoramic photos are relatively simple.”

Click here for how to take photographs and stitch your own panoramas from them.