What is Facebook?
Facebook is a social media where you can become "friends" with others who have a Facebook profile. You can be friends with your friends, family, colleagues and a lot of others. You can thus follow their lives, through the status updates they post and chat with them.
Companies can also have a Facebook page, which can be used to post about the company, news and everything you want to share with others. People can thus go in and "Like" company profiles, to follow what they share.
One can access Facebook through their app or through the internet.
Read the blog on how to sell via Facebook.