Cyber security involves protecting computers and accounts from unauthorized access. It has two broad classifications: web security, which protects internet use, and home security, which protects personal systems. Components of web security include email, Facebook, and online banking security. Components of home security include antivirus software, firewalls, and strong passwords. The document provides tips for securing a Facebook account, such as enabling login notifications and recognized devices. It also discusses playing games on YouTube and posting display pictures as emoticons in Facebook chat.