What exactly is homeschooling?
do you know anyone who was homeschooled? Homeschooling, also known as home education
A coworker mentioned he was home schooled when he was younger.
i have heard it  is usually conducted by a parent or tutor.
Is it popular?
it is but many  use less formal ways of educating.
I see. I wonder if there are any advantages to homeschooling.
to get with family more,  "Homeschooling" is the term commonly used in North America