Malicious code is an unwanted file or program that causes harm to a computer or compromises data stored on a computer. Generally, it (malicious data) enters a system when a user clicks on a vulnerable link or downloads an infected file. Once a system is infected, it can cause a computer to – slow down, become unresponsive to keyboard inputs, overheat, get bombarded with ads, and more.

OWASP (Open Web Application Security Project) is a nonprofit organization established in 2001 to instruct (guide) website owners and security experts on constructing, purchasing, and maintaining trustworthy and secure software applications. In lay terms, it is a forum where several application security firms and industry specialists provide input to identify the top, most critical security risks that threaten web applications.