An introduction to Finnish word stems

What is a word stem in the Finnish language? Why does it matter? Watch this video to find out.
The Finnish 3rd infinitive: verb stem + -MAAN, -MASSA, -MASTA

You may have seen Finnish verb forms like syömään, syömässä and syömästä. These are the 3 most common ones out of the 5 different varieties of the 3rd infinitive.