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This paper talks about data security which is the protection of data from unauthorized access. It defines data insecurity as unauthorized access and collection of data with or without the users’ knowledge. It explains how data are collected from the internet and through applications some of which are; Adware, Spyware, Browser Hijacking Software, Browsing History, In-Website Browsing History. It goes further to list what data can be collected by a website or an application with pictorial examples. This paper identifies the methods of preventing data breach, for example; Using internet anonymously, Authentication, Elimination of Third-Party Cookies, Use of Privacy Extensions or Add-Ons, Use of safe search engines, Encryption method and Firewall.