What is Facebook? History: Facebook is a Internet service which is used to get and/or remain connected with the people.Facebook was founded in 2004, February 4th by Mark Zukerberg( CEO) with his team of Harvard University .This started running aggresively from 2006.Even Google wanted to purchase this but Zuckerberg refused to sell it.Aheading with that stragety currently Facebook is one of top services provided in the services.Services: This provides service to remain connected with people like your friends, cousins, sirs, teachers, Celebrties etc.1) You can get connected by sending them a friend request and if they accept it ull become friends.After account creation you will be provided a seperate account where your posts are visible in timeline.2) You can post your photos, videos, text status, photo/video status etc., 3) You can wish your friends on their birthday.by getting notified in notifications section.4) You can chat with your friends with text messages, emojies, stickers, GIF’s, photos, videos etc.Priorly there were no options of GIF, photos to message others.we could only send in their timelines.Now everything updated.5) You can keep your own profile photo and cover photos.6) An option where you can like your friends photos.Another option where you can like the pages.You can like the pages of celebreties so that you can like their photos/videos/text status if they posted.Indirectly you can be in touch with them.You can also create/join groups to discuss among the group memberss.You can create your School friends group, college friends group, celebreties group, Science group etc., Other services: There are many advertisments posted in this where you can directly shop, sell etc., There are many apps and other websites where you can directly sign up with them like gmail with Facebook account directly so that the details are recieved from facebook account.Currently there are 2billion users in the world.There are even Facebook apps.1) Facebook App2) Facebook LiteFacebook now provided messenger to chat.Facebook App occupies more space than shown in play store.Faceboom lite occupies less space.They are like awt components and swing components respectively in Java.Now Facebook provided a new feature where we can react to the posts to express our feelings like angry, sad, wow, love. you can even create message groups.There are more surprising features to say.Finally I would recommend you use this and register yourselves.Thank you.