As far as I can tell, all parents are homeschoolers. You're the one that teaches your child to walk, talk, go to the bathroom, act politely, etc. So in those terms every parent is a homeschooler.
However, I also homeschool my children, and have for the last five years. (My oldest is going into 5th grade, my youngest is going into 1st grade.)
There are different homeschooling laws in each state and in each country. A good place to find the laws in your area is
www.hslda.com. They also have hints on how to homeschool.
There are days I love homeschooling, and there are days I wish I could cart my kids off to the local school and leave them there. However, for the most part, I love homeschooling, and I plan to do so until I am told I can't.