Kayaks are thin boat-like that is used by one to two person only for kayaking and it is a form of an extreme water sports which is highly popular today.
Kayaks are mostly made of strong and hard wood that can sustain and last from direct hit of waves and crushing on rocks.
There are several place that sell kayaks and if you are lucky, you can find people who are actually making it personally. There are also manufactured kayaks and are very popular since there is a huge number of demands for adventurer who love to try kayaking. You may try to watch different videos and read online about kayaks and kayaking.