Not alike Geralt from the books, written by Andrzej Sapkowski, this Witcher is using samurai-like swords and techniques.
This TV series and a full feature movie have the same cast and has been shot simultaneously to reduce costs of production. Some of the scenes from the feature movie been used in the TV series as well.
Differs from the books in many aspects. The Witcher's sword and technique of using it, one of the prolific characters' death and the upbringing of the main character - to mention just a few.
Based on the first two books from Andrzej Sapkowski's "The Witcher" series.