Microsoft has urged users to move off of Windows XP before support for its old OS expires next year. After April 8, 2014, Microsoft will halt support for Windows XP. That means Microsoft won t issue patches or other security fixes for its opeating system. Since Microsoft will never patch Windows XP again after April 2014, eventually some vulneability that affects XP will be found. As Rains notes, the sophistication of malware has only improved, meaning that your XP machine is even more vulnerable.
Source: https://www.pcworld.com/article/2046839/zero-day-forever-move-away-from-windows-xp-now.html