The word "from" is a preposition used to indicate the point in space or time at which a journey, motion, or action starts or originates. It establishes a relationship of starting location, source, or cause. For example, if you say "I am from Canada," it specifies the place of origin.
The word "from" comes from the Old English "fram," which means "away from, in front of, or forward." It has roots in Proto-Germanic *fram, which conveys the idea of moving away or being apart.