Tectonic plate interactions are of three different basic types. The boundaries can be continental/oceanic, continental/continental, or oceanic/oceanic depending on the density of the land itself.
Divergent boundaries-areas where plates move away from each other, forming either mid-oceanic ridges or rift valleys. (example-East African Great Rift Valley)
Convergent boundaries are areas where plates move toward each other and collide. These are also known as compressional or destructive boundaries. (example-The Himalayan Mnts.)
Transform boundaries- occur when two plates grind past each other with only limited convergent or divergent activity. (example-San Andreas Fault)
source: (http://en.wikipedia.org/wiki/List_of_tectonic_plate_interactions) & by looking at the plate tectonic lab notes.
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